Chapter 3.5, Problem 5E

Let ​f(x)=4−x2and let a=−3. Complete parts​ (a) through​ (d) below.   PARTS A-D ARE THE 1ST IMAGE I INCLUDED BELOW. I kept getting it wrong and those are the questions. THE SECOND IMAGE IS THE QUESTION. Also please include proper coordinates and correct graph such as the first image shows.

Differentiate.

9. Simplify sec² x - 1 sec² x