PHP/Math/atan
float atan ( float num ) calculates the arc tangent value
<source lang="html4strict">
<?
$atan1 = atan(0.4346); $atan2 = atan(tan(80));
?>
</source>
<source lang="html4strict">
<?
$atan1 = atan(0.4346); $atan2 = atan(tan(80));
?>
</source>