COS(3)

NAME
cos - cosine function

SYNOPSIS
#include <math.h>
double
cos(double x);
long double
cosl(long double x);
float
cosf(float x);

DESCRIPTION
The cos() function computes the cosine of x (measured in radians).

SPECIAL VALUES
cos(±0) returns 1.

cos(±infinity) returns a NaN and raises the "invalid" floating-point exception.

SEE ALSO
sin(3), tan(3), asin(3), acos(3), atan(3), atan2(3), sinh(3), cosh(3), tanh(3), math(3)

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