Acosh

Support PHP 4> = 4.1.0, PHP 5 acosh - hyperbolic cosine

Description

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