d/(dx)[((tan^2 2x-tan^2x)/(1-tan^2 2xtan...

`d/(dx)[((tan^2 2x-tan^2x)/(1-tan^2 2xtan^2x))cot3x]=`

A

tan 2x tan x

B

tan 3x tan x

C

`sec^2 x`

D

sec x tan x

Verified by Experts

The correct Answer is:

C

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