ACOSH

Returns the inverse hyperbolic cosine of a number. 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)

Number    is any real number equal to or greater than 1.

Example

Formula	Description (Result)
=ACOSH(1)	Inverse hyperbolic cosine of 1 (0)
=ACOSH(10)	Inverse hyperbolic cosine of 10 (2.993223)