Apple iWork '09 - Manual (Page 332)

“TANH” on page 339
“Listing of Trigonometric Functions” on page 326
“Value Types” on page 36
“The Elements of Formulas” on page 15
“Using the Keyboard and Mouse to Create and Edit Formulas” on page 26
“Pasting from Examples in Help” on page 41
ATANH
The ATANH function returns the inverse hyperbolic tangent of a number.
ATANH(num)
 num: A number. num is a number value that must be greater than –1 and less than 1.
Examples
=ATANH(0.995054753686731) returns 3.
=ATANH(TANH(2)) returns 2.
Related Topics
For related functions and additional information, see:
“ATAN” on page 330
“ATAN2” on page 331
“TAN” on page 338
“TANH” on page 339
“Listing of Trigonometric Functions” on page 326
“Value Types” on page 36
“The Elements of Formulas” on page 15
“Using the Keyboard and Mouse to Create and Edit Formulas” on page 26
“Pasting from Examples in Help” on page 41
332 Chapter 12 Trigonometric Functions