Apple iWork '09 - Manual (Page 13)

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iWork comes with more than 250 functions you can use
to simplify statistical, financial, engineering, and other
computations. The built-in Function Browser gives you
a quick way to learn about functions and add them to a
formula.
To get started, just type the equal sign in an empty table cell to open the Formula
Editor. Then choose Insert > Function > Show Function Browser.
This user guide provides detailed instructions to help you write formulas and use
functions. In addition to this book, other resources are available to help you.
Onscreen help
Onscreen help contains all of the information in this book in an easy-to-search format
that’s always available on your computer. You can open iWork Formulas & Functions
Help from the Help menu in any iWork application. With Numbers, Pages, or Keynote
open, choose Help > “iWork Formulas & Functions Help.”
Pr
efac
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Welcome to iWork Formulas &
Functions