What is ACOSH function in Excel? ACOSH function is one of the Math and Trig functions in Microsoft Excel that 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 of ACOSH function ACOSH(number) The ACOSH function syntax…