Question

Question #f8fe8

Answer 1

`0`

Explanation:

Since we're differentiating with respect to `x`, we want to track how the function changes as `x` changes.

The function in question is `cos^2(a+y)`, which doesn't depend on `x` at all. So, as `x` changes, `cos^2(a+y)` doesn't change at all.

So, with respect to `x`, the function `cos^2(a+y)` is constant, and

`d/dxcos^2(a+y)=0`