Keypad Reference

Keypad Buttons in the Formula Editor describes the keypad buttons.

Keypad Buttons in the Formula Editor
Name	Description
Arithmetic buttons	Work as they normally do on a pocket calculator, providing addition, multiplication, subtraction, and division operators.
Insert	Inserts a new clause or function argument. First select the existing clause or argument that you want the new element to follow, and then click this button. The new clause appears and is selected. You can also insert a new clause or argument by typing a comma. Pressing ALT and the Insert icon inserts a new field before the selected field
Delete	Deletes an element’s value, or deletes a clause. The delete button functions the same as the Delete key on the keyboard.
Exponent	Raises a given value to a specified power. It has an exponent of two by default.
Root	Calculates the specified root of the radicand. It has an implied index of two (a square root), which is not displayed.
Switch terms	Looks at the operator that is central to the selected expression and switches the expressions on either side of that operator.
Unary sign function	Inverts the sign of the argument. Apply the unary sign function to variable expressions or use it to enter negative constants.
Local variable (Make Temporary Variable)	Creates and displays a local variable and assigns it the value of the selected expression. The local variable has the default name t0 in an expression and a semicolon after it. See Use Local Variables, for details about creating and inserting local variables. See Use Local Variables in a Formula, for an example.
Delete expression (Peel)	Removes the outermost expression with the first argument. You can repeat this process to delete a formula term by term. See Use the Delete Expression Button, for an example.