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If You Execute The Wrong Function - HP -28S Manual

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If You Execute the Wrong Function
The HP-28S includes recovery features to help you "backtrack" when
you mistakenly execute a function. The following steps reverse the
effects of a function, whether a one-number or two-number function.
1. Press
. 1
UNDO
1
to recover the previous contents of the stack.
2. If a number was in the command line when you made the mis-
take, press
.1
COMMAND
I
to recover the previous contents of the
command line.
3. Continue the calculation.
2: Doing Arithmetic
47

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