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42 Getting started
You can repeat the previous calculation simply by pressing
E. This can be useful if the previous calculation
involved Ans. For example, suppose you want to calculate
the nth root of 2 when n is 2, 4, 8, 16, 32, and so on.
1. Calculate the square root of 2.
Sj2E
2. Now enter √Ans.
SjS+E
This calculates the fourth root of 2.
3. Press E
repeatedly. Each time
you press, the root is
twice the previous
root. The last answer
shown in the
illustration at the right
is .
To reuse an
expression or result
from the CAS
When your are working in Home view, you can retrieve
an expression or result from the CAS by tapping Z and
selecting Get from CAS. The CAS opens. Press
=
or
\
until the item you want to retrieve is highlighted and
press E. The highlighted item is copied to the cursor
point in Home view.
Storing a value in a variable
You can store a value in a variable (that is, assign a value
to a variable). Then when you want to use that value in a
calculation, you can refer to it by the variable’s name. You
can create your own variables, or you can take advantage
of the built-in variables in Home view (named A to Z and
) and in the CAS (named a to z, and a few others). CAS
variables can be used in calculations in Home view, and
Home variables can be used in calculations in the CAS.
There are also built-in app variables and geometry
variables. These can also be used in calculations.
2
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