atanh

(PHP 4 >= 4.1.0, PHP 5)

atanh — Inverse hyperbolic tangent

Description

float atanh ( float $arg )

Returns the inverse hyperbolic tangent of arg, i.e. the value whose hyperbolic tangent is arg.

Parameters

arg

The argument to process

Return Values

Inverse hyperbolic tangent of arg

Changelog

Version	Description
5.3.0	This function is now available on all platforms

See Also

• tanh() - Hyperbolic tangent
• atan() - Arc tangent
• asinh() - Inverse hyperbolic sine
• acosh() - Inverse hyperbolic cosine