This document is a Mac OS X manual page. Manual pages are a command-line technology for providing documentation. You can view these manual pages locally using the man(1) command. These manual pages come from many different sources, and thus, have a variety of writing styles.

For more information about the manual page format, see the manual page for manpages(5).

COS(3)                   BSD Library Functions Manual                   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).

BSD                            November 20, 2002                           BSD