ACOSH

Returns the inverse hyperbolic cosine of a number. The number must be greater than or equal to 1. The inverse hyperbolic cosine is the value whose hyperbolic cosine is number, so ACOSH(COSH(number)) equals number.

Syntax

ACOSH(number)  

Parameters

Term Definition
number Any real number equal to or greater than 1.

Return value

Returns the inverse hyperbolic cosine of a number.

Example

Formula Description Result
=ACOSH(1) Inverse hyperbolic cosine of 1. 0
=ACOSH(10) Inverse hyperbolic cosine of 10. 2.993228