php man page for cos

COS(3)									 1								    COS(3)

cos - Cosine

SYNOPSIS
       float cos (float  $arg)

DESCRIPTION
       cos(3) returns the cosine of the $arg parameter. The $arg parameter is in radians.

PARAMETERS
	      o $arg
		- An angle in radians

RETURN VALUES
	The cosine of $arg

EXAMPLES
       Example #1

	      cos(3) example

	      <?php

	      echo cos(M_PI); // -1

	      ?>

SEE ALSO
       acos(3), sin(3), tan(3), deg2rad(3).

PHP Documentation Group 														    COS(3)