Texas Instruments TITANIUM TI-89 - Manual (Page 216)

Calculator Home Screen 216
b) Press …
1 to select the d (differentiate) function.
Note: You can also reuse an expression by creating a user-defined function.
3. Paste the copied information into a different application.
Note: By copying and pasting, you can easily transfer information from one
application to another.
c) Press:
@ 8 7
to paste the copied expression.
d) Complete the new entry, and press
¸.
a) Press 8 # to display the Y= Editor.
b) Press ¸ to define
y1(x) .
c) Press:
@ 8 7
to paste.
d) Press ¸ to save the new
definition.