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Trigonometry

Trigonometry is the geometry of the circle written as functions. Exact values from the unit circle, equations with infinitely many solutions, and the identities that make them tame.

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Introductory The unit circle Exact values of sine and cosine at the special angles. sin(pi/3) Core Trigonometric equations Reference angles and the infinitely many solutions. sin(x) = 1/2 Core Trigonometric identities Pythagorean, double-angle and sum identities, verified by simplification. simplify sin(x)^2 + cos(x)^2 Introductory Degrees and radians Two ways to measure an angle, and converting between them. 30 degrees to radians

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