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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.
Lecciones
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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