HP 48gII - Manual (Page 83)

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Press ‚¯to recover the original expression.
Note: Pressing the @EVAL or the @SIMP soft menu keys, while the entire original
expression is selected, produces the following simplification of the expression:
Using the CMDS menu key
With the original polynomial expression used in the previous exercise still
selected, press the
L key to show the @CMDS and @HELP soft menu keys.
These two commands belong to the second part of the soft menu available
with the Equation Writer. Let’s try this example as an application of the
@CMDS
soft menu key: Press the @CMDS soft menu key to get the list of CAS commands:
Next, select the command DERVX (the derivative with respect to the variable X,
the current CAS independent variable) by using:
~d˜˜˜ .
Command DERVX will now be selected:
Press the @@OK@@ soft menu key (F), to get: