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.

Examples

ACOSH(1) equals 0

ACOSH(10) equals 2.993223