Math Functions
PHP Manual

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.

Parameters

arg

The value to process

Return Values

The inverse hyperbolic cosine of arg

Changelog

Version Description
5.3.0 This function is now available on all platforms

See Also

  • cosh
  • acos
  • asinh
  • atanh