Apple iWork '09 - Manual (Page 328)

“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
ACOSH
The ACOSH function returns the inverse hyperbolic cosine (hyperbolic arccosine) of a
number.
ACOSH(num)
 num: A number. num is a number value that must be greater than or equal to 1.
Examples
=ACOSH(10.0676619957778) returns 3.
=ACOSH(COSH(5)) returns 5.
Related Topics
For related functions and additional information, see:
“ACOS” on page 327
“COS” on page 333
“COSH” on page 334
“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
328 Chapter 12 Trigonometric Functions