Differentiate:

1. y = x^-2 - 2x^-1 + 8

2. y = sin³ 2x

3. y = x²tan 3x

4.

5.

6. y = cos x sin 2x

7. y = tan(2x / 5)

8. y = csc (4x)

9. y = cot 5x

10.