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 TOPICS This page:   trigonometry    Search   Dr. Math See also the Dr. Math FAQ:   trigonometry formulas See also the Internet Library:   trigonometry HIGH SCHOOL About Math Analysis Algebra    basic algebra    equations/graphs/      translations    linear algebra    linear equations    polynomials Calculus Complex Numbers Calculators/    Computers Definitions Discrete Math    permutations/    combinations Exponents    Logarithms Fibonacci Sequence/   Golden Ratio Fractals Functions Geometry    Euclidean/plane      conic sections/        circles      constructions      coordinate plane      triangles/polygons    higher-dimensional      polyhedra    non-Euclidean    practical geometry    symmetry/tessellations History/Biography Interest Logic Negative Numbers Number Theory Physics/Chemistry Probability Projects Puzzles Sequences/Series Sets Square/Cube Roots Statistics Transcendental   Numbers Trigonometry Browse High School Trigonometry Stars indicate particularly interesting answers or good places to begin browsing. Selected answers to common questions:     DeMoivre's theorem.     Volume of a tank. Using the Law of Cosines [05/21/1998] Given the length of three sides of a triangle, how can I find the angle between any two of the sides? Using the Laws of Sine and Cosine [9/24/1995] How do I find the sine and cosine of pi/12? Using Trig Identities to Simplify [7/26/1996] How do I simplify ((sin @ - 1)/cos @) - (cos @/(sin @ -1)) ? Using Trigonometric Identities [05/31/1999] How can I prove that sin(4x) = 2sin(2x) - 8sin^3(x)cosx ? Value of Angle DBC [1/23/1996] Imagine a triangle ABC on which angles B and C are equal to 80... Vector Angles: Prove A.B = |A||B|cosA [07/13/1998] I just finished my pre-calc class, and at the end we covered vectors... Verifying Trigonometric Identities [07/12/2002] How do you verify a trigonometric identity? Verify the Identity [04/17/2003] Verify the identity: (csc x)/(tan x + cot x) = cos x. Vertices of an Octagon [10/29/1996] Find the coordinates of the vertices of an octagon with center (0,0) when it is inscribed in a square. What Is the Length of PR? [01/01/2003] In a circle of radius 6, a triangle PQR is drawn having QR=8 and PQ=10. What is the Longest Pole? [04/04/1999] A metal pole L ft long is pushed on the floor from one corridor into another corridor at a right angle... What is the Relation between tan and tanh? [08/25/2001] I want to know the relation between tangent and hyperbolic tangent. What is Trigonometry? [8/20/1996] What is trigonometry, and what is it used for? What's 'Arccos'? [06/17/2001] I'm trying to write a program in Visual Basic 6 about the distance calculation between two cities. When to Use Law of Sines or Law of Cosines [02/01/2006] When do we use the law of sines as opposed to the law of cosines? Where Will the Runners Meet? [03/29/1999] Two runners, A and B, start 90 degrees away from each other on a circular track and run at the same speed. If Runner B decides to cut across the track, where will they meet? Which Side is Longer? [1/27/1995] You are given a quadrilateral, ABCD, with diagonal DB, angle ADC = 90, angle DBC = 43, angle C = 91, side AD = 9, side DC = 9. Find which is longer AB or AD. Why does a/SinA = b/SinB = c/SinC? [08/12/1997] I was just playing aroung with a proof of a triangle and came across the fact that a/SinA = b/SinB = c/SinC. Why? Why Radians? [12/03/1997] Why use radians to measure angles over degrees? Why Use Radians instead of Degrees? [09/25/2001] Consider Maclaurin's theorem, from which we derive the Taylor series... Will the Tree Hit the House? [05/18/1999] A tree is leaning at 70 degrees, our house is 66 1/2 feet away, and the angle from our house to the top of the tree is 40 degrees... X = TanX [03/21/2001] Show that x = tanx has an infinite number of solutions. Page: [

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