Find the differentiation of ((cot^2x-1)/...

Find the differentiation of `((cot^2x-1)/(cot^2x+1))` w.r.t. `\ x`

A

`-sin2x`

B

`2sin2x`

C

`2cos2x`

D

`-2sin2x`

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The correct Answer is:

D

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