cos

NAME

cos

INTERFACE

#include <math.h>

double cos ( double x ) long cosl ( long double x ) float cosf ( float x )

#include <complex.h> double complex ccos(double complex z) long double complex ccosl(long double complex z) float complex ccosf(float complex z)

DESCRIPTION

The cos function computes the cosine of x (measured in radians). It returns a value in the range of -1 to 1:

SPECIAL VALUES

cos ( 0 ) returns 1. cos ( &infin; ) returns a NaN and raises the invalid floating-point exception.

SEE ALSO

sin , tan , asin , acos , atan , atan2 , sinh , cosh , tanh

STANDARDS

The cos function conforms to ISO/IEC 9899:1999(E).