Hi
acos()
The acos() function returns the arccosine of a number as a numeric value value between 0 and PI radians
PHP Code:
<?php
echo(acos(0.64) . "<br />");
echo(acos(0) . "<br />");
echo(acos(-1) . "<br />");
echo(acos(1) . "<br />");
echo(acos(2))
?>
Regards
Falcon
