ACOSH

Description: Returns the inverse hyperbolic cosine of a number. 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.

• When used in an event analysis flowchart, Number must evaluate to a numerical value. It can include:

• Numerical values

• Standard operands (+, -, *, /)

• Predefined mathematical functions (exp, log, sin, etc.)

• Event analysis internal functions

• Event analysis resources

• References to any ReliaSoft Workbooks

Example:

• ACOSH(1) = 0 [the inverse hyperbolic cosine of 1]

• ACOSH(10) = 2.993223 [the inverse hyperbolic cosine of 10]