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COS(3) Library Functions Manual COS(3)

cos, cosf, coslcosine functions

#include <math.h>

double
cos(double x);

float
cosf(float x);

long double
cosl(long double x);

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.

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

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

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

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

September 6, 2019 OpenBSD-current