   #PHP Manual Mathematical Functions ceil cosh

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                                      cos

   (PHP 3, PHP 4 )
   cos -- Cosine

Description

   float cos ( float arg)

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

   Example 1. cos() example
   <?php
   echo cos(M_PI); // -1
   ?>

   See also acos(), sin(), tan() and deg2rad().
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