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Getting started 37
• RPN (Reverse Polish Notation). [Not available in CAS
view.]
The arguments of the expression are entered first
followed by the operator. The entry of an operator
automatically evaluates what has already been
entered. Thus you will need to enter a two-operator
expression (as in the example above) in two steps, one
for each operator:
Step 1: 5
h – the natural logarithm of 5 is
calculated and displayed in history.
Step 2:
Szn – is entered as a divisor and
applied to the previous result.
More information about RPN mode can be found in
chapter 2, “Reverse Polish Notation (RPN)”, starting
on page 47.
Note that on page 2 of the Home Settings screen, you
can specify whether you want to display your calculations
in Textbook format or not. This refers to the appearance of
your calculations in the history section of both Home view
and CAS view. This is a different setting from the Entry
setting discussed above.
Entering expressions
The examples that follow assume that the entry mode is
Textbook.
• An expression can contain numbers, functions, and
variables.
• To enter a function, press the appropriate key, or
open a Toolbox menu and select the function. You
can also enter a function by using the alpha keys to
spell out its name.
• When you have finished entering the expression,
press
E to evaluate it.