If , prove that .

9

Differentiate the following functions:

(i) If y = 6x⁵ – 4x⁴ – 2x² + 5x – 9, find at x = -1.

(ii) If y = (sin x + tan x), find at .

(iii) If , find at .

10

If , show that .

12

If , find .

13

, find