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Mathematics for 3D Game Programming and Computer Graphics, Third Edition by Eric Lengyel

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Appendix B. Trigonometry Reference

Function Definitions

For the angle α shown in Figure B.1, the trigonometric functions are defined as follows.

Equation (B.1) defines the trigonometric functions in terms of the angle α shown in this triangle.

Figure B.1. Equation (B.1) defines the trigonometric functions in terms of the angle α shown in this triangle.

Equation B.1. 

The relationships among the trigonometric functions listed below follow immediately from the definitions.

Equation B.2. 

Symmetry and Phase Shifts

The cosine function is an even function, meaning ...

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