Texas Instruments TI-89 Manual Book page 23

Example
The variable x is not defined in the current folder.
1. In cell A1, enter x^2+5x.
2. In cell A2, enter =2 = (a1,x). Cell A2 displays 2x+5,
which is the derivative of the function in cell A1, with
respect to x.
Commands with multiple outputs are not allowed in cells and
display as the word "Error" in the cell.
Entering a function
•
If a function's argument is a list, a cell range is also a valid
argument.
•
If a function's argument is a value, a cell name is also a valid
argument.
•
When a function is not used as part of a formula, only the
resulting value of the function is saved in the cell.
TI-89 / TI-92 Plus / Voyage™ 200 PLT CellSheet™ App Page 23