Question

What is the derivative of `sec^2 (x) - tan^2 (x)`?

Answer 1

`0`

Explanation:

We want to find `"d"/("d"x)(sec^2x-tan^2x)`.

This derivative becomes trivial if we note that `sec^2x-tan^2x=1`.

So

`"d"/("d"x)(sec^2x-tan^2x)="d"/("d"x)1=0`