NAME

cos, cosf, cosl - cosine function

SYNOPSIS

#include <math.h>

double cos(double x);

float cosf(float x);

long double cosl(long double x);

Link with -lm.

DESCRIPTION

The cos() function returns the cosine of x, where x is given in radians.

RETURN VALUE

The cos() function returns a value between -1 and 1.

CONFORMING TO

SVr4, 4.3BSD, C99. The float and long double variants are C99 requirements.

SEE ALSO

acos(3), asin(3), atan(3), atan2(3), ccos(3), sin(3), tan(3)