Acosh
Support PHP 4> = 4.1.0, PHP 5 acosh - hyperbolic cosine
Description
php
float acos ( float $arg )
Vary the arcus cosine of the arg parameter in radians. acos() is the inverse of the cos() function, which means that a==cos(acos(a)) for every value in the definition domain of the acos() function.
Parameters
- arg Argument for processing
Return values
Arccos of the argument in radians.
Differences from earlier versions
5.3.0 - This feature is now available on all platforms