php man page for sin

SIN(3)									 1								    SIN(3)

sin - Sine

SYNOPSIS
       float sin (float  $arg)

DESCRIPTION
       sin(3) returns the sine of the $arg parameter. The $arg parameter is in radians.

PARAMETERS
	      o $arg
		- A value in radians

RETURN VALUES
	The sine of $arg

EXAMPLES
       Example #1

	      sin(3) example

	      <?php

	      // Precision depends on your precision directive
	      echo sin(deg2rad(60));  //  0.866025403 ...
	      echo sin(60);	      // -0.304810621 ...

	      ?>

SEE ALSO
       asin(3), sinh(3), cos(3), tan(3), deg2rad(3).

PHP Documentation Group 														    SIN(3)