HP 40gs - Manual (Page 253)

Equation Writer 15-1
15
Equation Writer
Using CAS in the Equation Writer
The Equation Writer enables you to type expressions that
you want to simplify, factor, differentiate, integrate, and
so on, and then work them through as if on paper.
The key on the HOME
screen menu bar opens the
Equation Writer, and the
key closes it.
This chapter explains how to
write an expression in the Equation Writer using the
menus and the keyboard, how to select a subexpression,
how to apply CAS functions to an expression or
subexpression and how to store values in the Equation
Writer variables.
Chapter 14 explains all the symbolic calculation functions
contained in the various menus, and chapter 16 provides
numerous examples showing the use of the Equation
Writer.
The Equation Writer menu bar
The Equation Writer has a
number of soft menu keys.
TOOL menu Unlike the other soft menu
keys, the
menu does
not give access to CAS
commands. Instead, it
provides access to a number
of utilities to help you work
with the Equation Writer. The following table explains
each of the utilities on the
menu.
hp40g+.book Page 1 Friday, December 9, 2005 1:03 AM