OpenGL Programming Guide: The Official Guide to Learning OpenGL, Version 4.3, Eighth Edition

Angle and Trigonometry Functions

Function parameters specified as angle are assumed to be in units of radians.

genType radians(genType degrees);

Converts degrees to radians:

genType degrees(genType radians);

Converts radians to degrees:

genType sin(genType angle);

The standard trigonometric sine function.

genType cos(genType angle);

The standard trigonometric cosine function.

genType tan(genType angle);

The standard trigonometric tangent.

genType asin(genType x);

Arc sine. Returns an angle whose sine is x. The range of values ...