NAME

cos, cosf, cosl — cosine functions

SYNOPSIS

#include <math.h>

double
cos(double x);

float
cosf(float x);

long double
cosl(long double x);

DESCRIPTION

The cos() function computes the cosine of x (measured in radians). The cosf() function is a single precision version of cos(). The cosl() function is an extended precision version of cos(). A large magnitude argument may yield a result with little or no significance.

RETURN VALUES

The cos(), cosf() and cosl() functions return the cosine value.

SEE ALSO

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

STANDARDS

The cos() function conforms to ANSI X3.159-1989 (“ANSI C89”).

HISTORY

A cos() function first appeared in Version 1 AT&T UNIX.