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Evaluating a sub-expression
Since we already have the sub-expression highlighted, let’s press
the @EVAL 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:
This expression does not fit in the Equation Writer screen. We can see the
entire expression by using a smaller-size font. Press the @BIG soft menu key to
get:
Even with the larger-size font, it is possible to navigate through the entire
expression by using the clear editing cursor. Try the following keystroke
sequence: C˜˜˜˜, to set the clear editing cursor atop the factor
()
3/1
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SIN