Accessing Catalog Help from the TI84 Plus Calculator’s Math Menu
Many of the Math menu functions on the TI84 Plus calculator have a hidden Help feature available at the press of a single key! To access the Catalog Help from the Math menu, follow these steps:

Press [MATH].

Use the following keys to select the appropriate submenu of the Math menu:

Use the following keys to place the cursor on the function you want to use:
Here, the cursor is in front of the fMin function from the MATH submenu. See the first screen.

Press [+] to access the Catalog Help.
It’s easy to forget the syntax for a function you don’t use very often. To save time, go ahead and type the syntax directly on the Catalog Help screen before pressing [ENTER]. See the second screen.

Press [TRACE] to PASTE or [GRAPH] to ESC.
Two onscreen prompts in the bottomright corner of the screen can be activated by pressing the keys located directly below the onscreen prompts. ESC takes you back to the submenu, and PASTE inserts the function as shown in the third screen.