Question

The derivative of f(x) =cos x at x=90
1. 0
2. 1
3. -1
4. 2

Answer 1

Answer:

derivative of cosx is -sinx so the value of -sinx at 90° is -1.......... option 3

Step-by-step explanation:

I hope this helps u.

Answer 2

Answer:

(-1) option 3 is a right answer