hp40g+.book Page 11 Friday, December 9, 2005 1:03 AM
If you’re typing an expression, the 
key enables you to erase what you’ve typed. If you’re selecting, you can:
•Cancel the selection without deleting the expression
by pressing 
. The cursor moves to the end of the deselected portion.
•Replace the selection with an expression, just by typing the desired expression.
•Transform the selected expression by applying a CAS function to it (which you can invoke from one of CAS menus along the bottom of the screen).
•Delete the selected expression by pressing:
•Delete a selected unary operator at the top of the expression tree by pressing:
For example, to replace SIN(expr) with COS(expr),
select SIN(expr), press 
and then press COS.
•Delete a binary infix operator and one of its arguments by selecting the argument you want delete and pressing:
For example, if you have the expression 1+2 and
select 1, pressing 
deletes 1+ and leaves only 2. Similarly, to delete F(x)= in the expression F(x)
=x2 – x +1, you select F(x) and then press 
. This produces x = x2 – x +1.
•Delete a binary operator by selecting:
Edit expr.
from the 
menu and then making the correction.
•Copy an element from CAS history. You access CAS
history by pressing 
. See page
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