Draw the graphs of the function

and its derivative on the closed interval **[-2, 2]**.

Using the TI-85 graphing calculator:

[Press here to see animation again!]

- If you are not familiar with the graphing of functions on the TI-85, then first read the Initial Setup page from Little's Basic Guide to the TI-85.
- Press the GRAPH key and then pick
**y(x)=**by pressing the F1 key. - If necessary, keep pressing F4 key until only
**y1=**appears on the screen. - At the prompt
**y1=**, type in**abs(x^2 - 1)**and press the ENTER key.

You can enter**abs**by using the catalogue which is obtained by pressing 2nd CATALOG. - At the prompt
**y2=**, type in**der1(y1,x,x)**and press the ENTER key.

You can enter**der1**by pressing 2nd CALC followed by the F3 key. - The range settings for the graph above is
**[-2, 2]**×**[- 4, 4]**: - Press the F5 key to choose
**GRAPH**.