10. Find the derivative f'(x) of f (x) = 6x. [A] 6x [B] (In 6)6x [C] In x - 6x-1 [D] 6x - 5 In 6 [E] x6*-1 11. Let y = cot 1x + sec x. Find y'. [A] 1 1 - sec x tan x [B] -1 x2+4 x2 + 1 sec x tan x [C] x2 + 1 + sec x tan x [D] -1 x2+4 [E] - 2 + sec x tan x x2 +1 sec 2x tan 2x