# HP 48gII User Manual Page 43

Graphing calculator.

The equation writer is a display mode in which you can build mathematical
expressions
using
explicit
mathematical
notation
including
fractions,
derivatives, integrals, roots, etc.
To use the equation writer for writing the
expression shown above, use the following keystrokes:
‚OR3*!Ü5-
1/3*3
———————
/23Q3™™+!¸2.5`
After pressing `the calculator displays the expression:
√ (3*(5-1/(3*3))/23^3+EXP(2.5))
Pressing `again will provide the following value. Accept Approx. mode
on, if asked, by pressing !!@@OK#@. [Note: The integer values used above, e.g.,
3, 5, 1, represent exact values. The EXP(2.5), however, cannot be expressed
as an exact value, therefore, a switch to Approx mode is required]:
You could also type the expression directly into the display without using the
equation writer, as follows:
R!Ü3.*!Ü5.-
1./ !Ü3.*3.™™
/23.Q3+!¸2.5`
to obtain the same result.
Change the operating mode to RPN by first pressing the H button. Select
the RPN operating mode by either using the \key, or pressing the @CHOOS
soft menu key. Press the !!@@OK#@ F soft menu key to complete the operation.
The display, for the RPN mode looks as follows:
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