Microsoft® Excel® 2010 Formulas & Functions Inside Out

ATANH()

Syntax. ATANH(number)

Definition. This function returns the inverse hyperbolic tangent of a number (see Figure 16-9). The number must be between –1 and 1.

Argument

• number (required) Any real number between –1 and 1

Background. The inverse hyperbolic functions are the inverse functions of the hyperbolic functions. The formula for the inverse hyperbolic tangent is:

Note

Inverse hyperbolic functions have the prefix ar in the same way that the inverse trigonometric functions have the prefix arc.

Figure 16-9. The function is odd and is defined only for ...