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)

COLOPHON

This page is part of release 2.77 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.