ACosh
Returns the inverse hyperbolic cosine of a number greater than or equal to 1.
Syntax
ACosh(number)ArcCosh(number)
number = number whose inverse hyperbolic cosine you want to calculate (greater than or equal to 1).
Remarks
If number is not greater than or equal to 1, the function will return a zero.
This function is the inverse of Cosh.
Example
ACosh(0) = 1 (inverse hyperbolic cosine of 1)