atanh

(PHP 4 >= 4.1.0)

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.

Poznßmka: Tato funkce nenφ implementovßna na platformßch Windows.

See also atan(), asin() and acos().