sin, sinf, cos, cosf---sine or cosine#include <math.h> double sin(double x); float sinf(float x); double cos(double x); float cosf(float x);Description
sin and cos compute (respectively) the sine and cosine
of the argument x. Angles are specified in radians.
sinf and cosf are identical, save that they take and
return float values.
Returns
The sine or cosine of x is returned.
Portability
sin and cos are ANSI C.
sinf and cosf are extensions.