acosh

(PHP 4 >= 4.1.0)

acosh -- Inverse hyperbolic cosine

Description

float acosh ( float arg)

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

Poznßmka: Tato funkce nenφ implementovßna na platformßch Windows.

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