sin, sinf, sinl - sine function

Syntax	#include <math.h> double sin(double x); C11 float sinf(float x); long double sinl(long double x); (End)
Description	These functions compute the sine of the floating-point number x, which specifies an angle in radians.
Return val.	sin(x)	if successful. The return value is a floating-point number in the range [-1.0, +1.0].
See also	acos(), asin(), atan(), atan2(), cos(), sinh(), tan(), math.h.