# HP 48gII User Manual Page 80

Graphing calculator.

™ ~‚2
(entering the factorial changes the cursor to the selection cursor)
˜˜™™
/3*~‚f Modifies exponential function argument
™™™™
R
(this operation also changes the cursor to the selection cursor)
˜˜ ™—— S Select θ
The resulting screen is the following:
Evaluating a sub-expression
Since we already have the sub-expression
the @EVAL D soft menu key to evaluate this sub-expression. The result is:
Some algebraic expressions cannot be simplified anymore. Try the following
keystrokes: —D. You will notice that nothing happens, other than the
highlighting of the entire argument of the LN function. This is because this
expression cannot be evaluated (or simplified) any more according to the
CAS rules. Trying the keystrokes: —D again does not produce any
changes on the expression. Another sequence of —D keystrokes,
however, modifies the expression as follows:
One more application of the —D keystrokes produces more changes:
Enters the factorial for the 3 in the square root
Selects the µ in the exponential function
Selects ∆y
Places a square root symbol on ∆y
1/3
and enter the SIN function
SIN
θ
1
3 /
highlighted, let's press
Page 2-22