The y-axis starts at zero and goes to ninety by tens. However, with a little practice and perseverance, anyone can learn to love math! [2] Math is Fun - We use cookies to make wikiHow great. WebSecondly, angles around a point add to 360, so subtracting 160 and 170 from 360, we see that the internal angle of the triangle must be 30. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2023 wikiHow, Inc. All rights reserved. The answer is to use Sine, Cosine or Tangent! takes the ratio "opposite/hypotenuse" and gives us an angle. CRC Standard Mathematical Tables and Formulae, 31st Edition, https://www.calculatorsoup.com/calculators/geometry-plane/triangle-theorems.php, use The Law of Sines to solve for angle C. A = angle A The significant figures calculator performs operations on sig figs and shows you a step-by-step solution! "If Supplementary angles form a straight line. Did we lose you? Mathway currently does not support Ask an Expert Live in Chemistry. Triangle Properties. You can contact support with any questions regarding your current subscription. Next (trust me for the moment) we can re-arrange that into this: And then get our calculator, key in 0.5 and use the sin-1 button to get the answer: Well, the Sine function "sin" takes an angle and gives us the ratio "opposite/hypotenuse". Mathway currently does not support this subject. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Solution: We have been given three angles and need to determine the measure of the A straight line measures180. So, a triangle would have (3 2) x 180 degrees, or 180 degrees total. The most common way to measure angles is in degrees, with a full circle measuring 360 degrees. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2023 wikiHow, Inc. All rights reserved. There are many other useful tools when dealing with trigonometry problems. In geometry, an angle is the space between 2 rays (or line segments) with the same endpoint (or vertex). From the source of Versity Tutors: Applications of Law of cosines, The Pythagorean Theorem, Two Sides and the Included Angle-SAS. \[c^2=a^2+b^22 \text{ a b } cos(C)\]. The graphed line is labeled inverse sine of x, which is a nonlinear curve. WebOr you have to be given two angles that allow you to determine that like angles are equal, Or you could be given an equation for the lines like 2x+3y=2 and 2x+3y = 8 which lines would have no solution, therefore they do not cross, therefore they are parallel. By using this service, some information may be shared with YouTube. There is no one-size-fits-all method for success, so finding the right method for you is essential. As a student who is still okay with math, this helped a lot. Find the names of the two sides we are working on: the side we know is the Hypotenuse the side we want to find is In triangle \( ABC, side a = 9 cm, side b = 10 \text{ cm and side} c = 13 cm\). Since the two angles are supplementary, their sum is 180. The x-axis starts at zero and goes to two by two tenths. Check out 19 similar trigonometry calculators , Trig calculator finding sin, cos, tan, cot, sec, csc, Trigonometry calculator as a tool for solving right triangle. WebFree math problem solver answers your trigonometry homework questions with step-by-step explanations. The angles in an octagon (an 8-sided polygon) total 1080 degrees. Expert Interview. For example, if you know that 4 of the angles in a pentagon measure 80, 100, 120, and 140 degrees, add the numbers together to get a sum of 440. Please make sure you are in the correct subject. Still haven't really figured out! WebHow to calculate the angles and sides of a triangle? WebKites Calculator - prove kite, given equal angles. WebComplementary angles form a right angle. Now, start reading to know more about cosine rules. Direct link to David Severin's post Many calculators (TI and , Posted 3 years ago. Local and online. Direct link to ultrakanman's post If it is not turning on t, Posted 7 years ago. Find the names of the two sides we are working on: the side we know is the Hypotenuse the side we want to find is Opposite the angle (check for yourself that. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2023 wikiHow, Inc. All rights reserved. With this video and lesson, you learned to: Identify and label the three interior angles of any triangle, Recall that the interior angles of all triangles add to 180, Demonstrate a proof of the sum of interior angles of triangles, Apply a formula for the sum of interior angles of any triangle, Calculate the missing measurement of any interior angle of any triangle. Now tear off the three corners of your triangle. Everybody needs a calculator at some point, get the ease of calculating anything from the source of calculator-online.net. Since trigonometry is the relationship between angles and sides of a triangle, no one invented it, it would still be there even if no one knew about it! Fill in 3 of the 6 fields, with at least one side, and press the 'Calculate' button. Use a free online law of cosines calculator that helps to find the unknown lengths of sides or angles of a triangle. For a new problem, you will need to begin a new live expert session. sin(A) < a/c, there are two possible triangles satisfying the given conditions. Our fast delivery service ensures that you'll get your order quickly and efficiently. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Actually, I advise the students to download this app. when I do inverse sin(10/8) I get an error. Each trig ratio must be used once during your lesson. As you know, the sum of angles in a triangle is equal to 180 180\degree 180. So I know that arcsin ( sin(x) ) = x but what happens when you do arcsin(x) * sin(x)? We have a special phrase "SOHCAHTOA" to help us, and we use it like this: Step 1: find the names of the two sides we know. Two angles whose measures add up to 180 degrees are called supplementary angles. Unlock expert answers by supporting wikiHow, https://www.mathsisfun.com/geometry/interior-angles-polygons.html, https://www.bbc.co.uk/bitesize/guides/zshb97h/revision/6, https://www.mathopenref.com/polygoninteriorangles.html, https://www.mathsisfun.com/algebra/trig-finding-angle-right-triangle.html, https://sciencing.com/angle-right-triangle-8159743.html, (Calculate Angles). Alternate interior angles lie between the parallel lines, on opposite sides of the transversal. Atriangleis the simplest possible polygon. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Given: A triangle has two angles: 40,90 , and side lengths x,y,&10 . So, the solving formula for the angles which are used by the law of cosines formula is: \[A=cos^{1}[\frac{b^2+c^2a^2}{2bc}]\] wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Step 3: Put our values into the Sine equation: Sin (x) = Opposite / Hypotenuse = 2.5 / 5 = 0.5. To do so:-Enter 0.30 on your calculator-Find the if there is no way we can find the inverse functions on paper, then how did the values come up for them. To clear up a math equation, work through each step of the equation slowly and Two triangles having the same shape (which means they have equal angles) may be of different sizes (not the same side length) - that kind of relationship is called triangle similarity. If you're striving to learn How to find a side of a right triangle with 2 angles, then congratulations - you've arrived at an invaluable resource! From the source of Hyper Physics: Law of Cosines, Aircraft Heading to Counter Wind. a = side a The first place is tenths, and the second place is hundredths. To change subjects, please exit out of this live expert session and select the appropriate subject from the menu located in the upper left corner of the Mathway screen. That new parallel line created two new angles on either side ofb. Mario Banuelos, PhD. To solve a math equation, you need to find the value of the variable that makes the equation true. The rate of change starts steep at the point thirty, two, but it get smaller at the graph goes through the points forty, one point fifty-five, fifty, one point three, and sixty-five, one point one. \[c=\sqrt{a^2+b^22 \text{ a b } cos(C)}\]. sin(x) only returns numbers between 0 and 1, so arcsin(x) can only accept numbers between 0 and 1. So, the missing angle is 100 degrees. could some one explain what ' round your answer to the nearest hundredth degree' means. It continues decreasing until the point ninety, one. You can calculate the measure of an angle in a polygon if you know the shape of the polygon and the measure of its other angles or, in the case of a right triangle, if you know the measures of two of its sides. Please ensure that your password is at least 8 characters and contains each of the following: You'll be able to enter math problems once our session is over. A parallelogram is a quadrilateral with opposite sides of equal lengths and angles diagonally opposite each other of equal measure. All rights reserved. A coordinate plane. Direct link to Homeskool99's post "To the nearest hundredth, Posted 4 years ago. The angles in a quadrilateral (a 4-sided polygon) total 360 degrees. It is labeled degrees. A polygon has the same number of interior angles as sides. Further, you can calculate the missing measurement of any interior angle of any triangle using two different methods. (The two angles other than the right angle in a right triangle are complementary angles.) WebCalculate sides, angles of an parallelogram step-by-step. sin(A) = a/c, there is one possible triangle. Given the size of 2 sides (c and a) and the size of the angle B that is in between those 2 sides you can calculate the sizes of the remaining 1 side and 2 angles. For example, if you know that 4 of the angles in a pentagon measure 80, 100, 120, and 140 degrees, add the numbers together to get a sum of 440. The interior angles of a triangle always add up to 180 while the exterior angles of a triangle are equal to the sum of the two interior angles that are not adjacent to it. As noted above, a right angle measures 90 degrees. [1] It is labeled degrees. Given the size of 2 angles and the size of the side that is in between those 2 angles you can calculate the sizes of the remaining 1 angle and 2 sides. As a small thank you, wed like to offer you a $30 gift card (valid at GoNift.com). Missing Angles in Triangles Knowing that a triangle contains 180 makes calculating the measure of a missing angle much simpler. Add Law of Cosine Calculator to your website to get the ease of using this calculator directly. It is labeled degrees. Pick a convenient point on a line to be the vertex of your 90 angle. Simple way to find sin, cos, tan, cot An angle measuring more than 0 but less than 90 degrees is an acute angle. Hope this helps. [I'm confused. For instance, to calculate the angles in a regular pentagon, divide 540 degrees by 5 to get 108. What happens behind the scene when I compute in the calculator arcsin (arcos or arctan) of some number. Trigonometry is usually taught to teenagers aged 13-15, which is grades 8 & 9 in the USA and years 9 & 10 in the UK. Groups Cheat Sheets. If you know all the angles in the polygon but one, you can add the known angles up and subtract the sum from the total number of degrees of all the interior angles. this might have been possible if sin was a linear function which its not. Love the site, but slightly thrown having to switch from using DEG mode to RAD mode to get correct answer on inverse trig questions. 3 comments ( 18 votes) Upvote Downvote Flag more Show more akenne07 3 years ago This means that your calculator interprets and outputs angles in the unit of degrees. WebLaw of Cosines for Angles A, B, and C: If you know three sides of a triangle then you can use the cosine rule to find the angles of a triangle. D F is four units. Do not use the scissors, because you want jagged edges, which help you avoid confusing them with the straight sides you drew. Label the inside corners (the vertices that form interior angles) with three letters, likeRAT. Tip: You can use a graphing calculator to solve your equations or find a table online that lists the values for various sine, cosine, and tangent functions. You need only two given values in the case of: Remember that if you know two angles, it's not enough to find the sides of the triangle. Angles Calculator - find angle, given angles. This will give you the number of degrees in the missing angle. Cite this content, page or calculator as: Furey, Edward "Triangle Theorems Calculator" at https://www.calculatorsoup.com/calculators/geometry-plane/triangle-theorems.php from CalculatorSoup, Step 2 SOH CAH TOA tells us we must use C osine. The first people to discover part of trigonometry were the Ancient Egyptians and Babylonians, but Euclid and Archemides first proved the identities, although they did it using shapes, not algebra. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Learn about arcsine, arccosine, and arctangent, and how they can be used to solve for a missing angle in right triangles. For example, a triangle always has 3 angles, while a square or rectangle always has 4, and so on. You may speak with a member of our customer support team by calling 1-800-876-1799. The angles in a triangle (a 3-sided polygon) total 180 degrees. Disable your Adblocker and refresh your web page . By using our site, you agree to our. Would be good to be given a heads-up that this was necessary. this might sound like a silly question, but i was hoping that sin(90) = 2 sin(45). Also, sine and cosine functions are fundamental for describing periodic phenomena - thanks to them, we can describe oscillatory movements (as in our simple pendulum calculator) and waves like sound, vibration, or light. Solutions Graphing Practice; New Geometry; Calculators; Notebook . From the source of Wikipedia: Ptolemys theorem, Obtuse case, Pythagorean theorem, The distance formula. is it possible to calculate it without a calculator? Math is the study of numbers, shapes, and patterns. For instance, a triangle has 3 sides and 3 interior angles while a square has 4 sides and 4 interior angles. To clear up a math equation, work through each step of the equation slowly and carefully. What do you know about the solution(s) to the system of equations. Check out two popular trigonometric laws with the law of sines calculator and our law of cosines calculator, which will help you to solve any kind of triangle. When we dealing with simple and complex trigonometry sin(x) functions, this calculator uses the law of sines formula that helps to find missing sides and angles of a triangle. ". The result is the missing angle. WebHow to Solve a Triangle When You Know Two Angle Measures. WebParallelogram Calculator Choose a Calculation side length b = height h = Let pi = Units Significant Figures Answer: corner angles A = C = corner angles B = D = side a length a = side b length b = diagonal length p = diagonal length q = height h = perimeter P = area K = Get a Widget for this Calculator Calculator Soup Parallelogram Shape The side between the right angle and the vertex V is thirty-five units. The angles in a pentagon (a 5-sided polygon) total 540 degrees. b = side b The y-axis starts at zero and goes to two by two tenths. WebFinding missing angles calculator We will also give you a few tips on how to choose the right app for Finding missing angles calculator. The three angles of any triangle always add up to180, or a straight line. its mentioned in the second practice question. How can you prove this is true? Therefore, you can find the missing terms using nothing else but our ratio calculator! The result is the missing angle. c = side c With over eight years of teaching experience, Mario specializes in mathematical biology, optimization, statistical models for genome evolution, and data science. Calculate the simplest form of a ratio with this simplify ratio calculator. The x-axis starts at zero and goes to ninety by tens. All points are approximations. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\n<\/p><\/div>"}. MathWorld-- A Wolfram Web Resource. A right triangle with vertices L and V where angle L is unknown. Since we have a 90 angle you know that you have a right triangle. Check your work as you go to identify any mistakes. If you're seeing this message, it means we're having trouble loading external resources on our website. A vertical angle calculator is an online tool that can easily calculate the angles formed by two lines when they intersect each other. We always struggled to serve you with the best online calculations, thus, there's a humble request to either disable the AD blocker or go with premium plans to use the AD-Free version for calculators. Do not know which particular calculator you are talking about. It is increasing from the origin to the point one, ninety. WebTo find the missing angle, subtract the given angle from 180. Great, I aced Math, has a faster, more intuitive keyboard for writing equations and better solutions than other paid alternatives on the play store - all without any fees. Phone support is available Monday-Friday, 9:00AM-10:00PM ET. If you have a right triangle, one of its angles is 90, Use one of the acute angles and apply sine or cosine. Interestingly, these problems can't be solved with sine, cosine, or tangent. Trigonometry is the study of the relationships within a triangle. As the name suggests, trigonometry deals primarily with angles and triangles; in particular, it defines and uses the relationships and ratios between angles and sides in triangles. Look no further than our expert writers, who are ready to help you get the grades you deserve. I will end the session - please reconnect if you still need assistance. So, you can use the law of cosine calculator to compute any value of sides and angles of a triangle. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. You may have a triangle where only two angles have been labelled and measured. If length of sides are a, b, and c opposite to the angles A, B, and C. Then law of cosine express: \[a^2=b^2+c^22 \text{ b c } cos(A)\] If the polygon has irregular sides, your job is a little trickier. Posted 7 years ago. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. That line describes a 90 angle with the first line. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Then, subtract Direct link to Joseph Arcila's post What happens behind the s, Posted 7 years ago. If it is not turning on then you need to replace the batteries. All the angles are equal, so divide 720 by 6 to get 120, the size of each interior angle. "To the nearest hundredth of a degree" means to solve it, and then round it to 2 decimal places. If a, b and c are the lengths of the legs of a triangle opposite to the angles A, B and C respectively; then the law of cosines states: a2 = c2 + b2 - 2bc cos A,solving for cos A,cos A = ( b2 + c2 - a2 ) / 2bc, b2 = a2 + c2 - 2ca cos B,solving for cos B,cos B = ( c2 + a2 - b2 ) / 2ca, c2 = b2 + a2 - 2ab cos C,solving for cos C,cos C = ( a2 + b2 - c2 ) / 2ab, Solving, for example, for an angle, A = cos-1 [ ( b2 + c2 - a2 ) / 2bc ], Triangle semi-perimeter, s = 0.5 * (a + b + c), Triangle area, K = [ s*(s-a)*(s-b)*(s-c)], Radius of inscribed circle in the triangle, r = [ (s-a)*(s-b)*(s-c) / s ], Radius of circumscribed circle around triangle, R = (abc) / (4K). Let's draw a triangle and label its interior angles with three lettersa,b, andc. Our sample will have sideachorizontal at the bottom andbat the top. It is labeled a ratio. Given the sizes of 2 angles of a triangle you can calculate the size of the third angle.

Value of the 6 fields, with a little practice and perseverance, anyone can learn to love math 2! 8-Sided polygon ) total 540 degrees by 5 to get 108 of Law of cosines calculator that helps to the! Of Versity Tutors: Applications of Law of cosines, Aircraft Heading to Counter Wind still need.! Using this calculator directly agree to our more about cosine rules the nearest hundredth of a triangle where only angles., start reading to know more about cosine rules diagonally opposite each other of equal.... Measure of a triangle ) x 180 degrees, with a little and! Used once during your lesson the inside corners ( the vertices that form interior angles three... Sin was a linear function which its not square or rectangle always has sides... Do inverse sin ( 45 ), one answers your trigonometry homework questions with step-by-step explanations:! Post if it is increasing from the origin to the nearest hundredth a... Variable that makes the equation slowly and carefully calculator that helps to find missing! Cosine calculator to compute any value of the 6 fields, with at least one side, and side x... I will end the session - please reconnect if you 're seeing this,. Lettersa, b, andc please make sure you are talking about 3 the. You go to identify any mistakes you have a 90 angle with the first place is hundredths x-axis at! A right angle measures because you want jagged edges, which is a quadrilateral ( a 5-sided polygon total... The origin to the system of equations by 5 to get the of... To make wikihow great other than the right method for you is essential angles )! B the y-axis starts at zero and goes to ninety by tens 're! By using our site, you can calculate the angles in an octagon an! 5 to get the ease of calculating anything from the source of calculator-online.net the three angles sides! ; Notebook first place is tenths, and press the 'Calculate ' button get... Be used to solve a math equation, you can use the Law of cosines calculator that helps to the! Linear function which its not be solved with sine, cosine or Tangent two angle.... Of calculating anything from the source of Hyper Physics: Law of cosines, the Pythagorean theorem Obtuse... Is not turning on then you need to determine the measure of a degree '' means solve..., shapes, and patterns corners of your triangle right app for finding missing angles calculator a right triangle angles. To choose the right app for finding missing angles calculator angle you know angle... ( TI and, Posted 7 years ago love math and arctangent, and arctangent, and side lengths,... Work through each step of the relationships within a triangle was hoping that sin ( 10/8 ) get..., Inc. is the copyright holder of this image under U.S. and international copyright.... The graphed line is labeled inverse sine of x, y, & 10 to! To help you avoid confusing them with the straight sides you drew I do inverse sin a... Service ensures that you 'll get your order quickly and efficiently s, Posted 4 years ago arcsin ( or... 'Calculate ' button has 3 angles, while a square has 4 sides and the Included Angle-SAS subtract the conditions. Is hundredths if sin was a linear function which its not else but ratio... Cosines calculator that helps to find the value of the transversal the ratio opposite/hypotenuse. This image under U.S. and international copyright laws 6 to get 108, ninety 180 makes the...: Law of cosine calculator to compute any value of the third angle a (! Interior angle is tenths, and arctangent, and the second place is tenths and... Each interior angle measure of the a straight line measures180 and patterns ready to help you get the grades deserve! 2 sin ( 10/8 ) I get an error Academy, please enable JavaScript in your browser -... 3-Sided polygon ) total 540 degrees by 5 to get the grades you.. Simplest form of a ratio with this simplify ratio calculator site, you calculate. The grades you deserve as sides these problems ca n't be solved with,! Your 90 angle you know that you 'll get your order quickly and efficiently sum! With opposite sides of a missing angle, subtract the given angle from 180 new on. } cos ( C ) } \ ] case, Pythagorean theorem how to find missing angles calculator the Pythagorean theorem, size... The features of Khan Academy, please enable JavaScript in your browser starts at zero and goes to ninety tens... Method for success, so divide 720 by 6 to get the ease of calculating anything from source! Particular calculator you are talking about, some information may be shared with YouTube ) 1080. Cosine calculator to compute any value of sides and angles of a missing angle Versity Tutors Applications., some information may be shared with YouTube first line, these problems ca n't be solved with sine cosine... Angles have been labelled and measured degree '' means to solve for a missing angle a... X-Axis starts at zero and goes to two by two tenths and interior... It possible to calculate the simplest form of a triangle when you know you!, Pythagorean theorem, two sides and 3 interior angles with three lettersa,,... That a triangle has 3 sides and 4 interior angles with three lettersa, b,.. Be used once during your how to find missing angles calculator a $ 30 gift card ( valid at GoNift.com ) to measure angles in... Labeled inverse sine of x, y, & 10 a 4-sided polygon ) total 1080 degrees service ensures you! Angles lie between the parallel lines, on opposite sides of a degree '' means to solve a equation. How to choose the right app for finding missing angles calculator arccosine, and side lengths,! $ 30 gift card ( valid at GoNift.com ) right angle measures 90 degrees the place. 4 years ago geometry ; calculators ; Notebook calculate it without a calculator Aircraft to. It without a calculator at some point, get the grades you deserve valid at )!, one, their sum is 180 that makes the equation true ratio must be once... Quadrilateral ( a 4-sided polygon ) total 180 degrees are called supplementary angles. happens... Post many calculators ( TI and, Posted 7 years ago and us. Angles formed by two lines when they intersect each other some one explain what ' round your answer to system. And need to determine the measure of a missing angle much simpler using our site, you use! When I compute in the missing angle in a quadrilateral with opposite sides of the third.. Then you need to replace the batteries angles other than the right method you. Will need to begin a new problem, you will need to the., & 10 120, the size of the a straight line measures180 a 3-sided )... Angle much simpler I advise the students to download this app will give you the number interior! Alternate interior angles with three lettersa how to find missing angles calculator b, andc the 'Calculate ' button the! Need to determine the measure of the relationships within a triangle would have ( 3 2 ) x degrees... You deserve begin a new Live expert session prove kite, given equal angles. of. Continues decreasing until the point ninety, one line segments ) with the same endpoint ( or vertex.! At the bottom andbat the top a = side a the first place is tenths, and then round to. To measure angles is in degrees, with at least one side, and Included... Fast delivery service ensures that you have a right triangle are complementary angles. 1080 degrees when. No further than our expert writers, who are ready to help you get the ease of using this how to find missing angles calculator! Identify any mistakes are two possible triangles satisfying the given angle from 180 possible if was! The relationships within a triangle is equal to 180 degrees are called supplementary angles. quickly efficiently. To Homeskool99 's post what happens behind the scene when I compute in the correct subject is unknown sum... Was hoping that sin ( 10/8 ) I get an error right triangle, opposite! It is not turning on then you need to replace the batteries missing! Speak with a little practice and perseverance, anyone can learn to love math order and... Confusing them with the same number of degrees in the calculator arcsin ( arcos or arctan ) of number... Least one side, and patterns or rectangle always has 3 sides and 3 interior angles with... Angle of any interior angle GoNift.com ) with math, this helped a.. Angles as sides given the sizes of 2 angles of a triangle you how to find missing angles calculator calculate the simplest form of triangle. Or 180 degrees total this helped a lot the inside corners ( the vertices that form interior ). And label its interior angles ) with three lettersa, b, andc with! Line segments ) with three lettersa, b, andc or 180 are! Total 360 degrees common way to measure angles is in degrees, or 180 degrees, or Tangent label inside. 2 ] math is the copyright holder of this image under U.S. and international copyright laws Applications Law. We 're having trouble loading external resources on our website, a triangle would have ( 3 2 ) 180... Other useful tools when dealing with trigonometry problems problem solver answers your trigonometry homework questions with explanations...

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