Find the (dy)/(dx) of y=cot^(-1)((1+x)/(...

Find the `(dy)/(dx)` of `y=cot^(-1)((1+x)/(1-x))`

A

`(1)/(1+x^2)`

B

`-(1)/(1+x^2)`

C

`2/(1+x^2)`

D

`-2/(1+x^2)`

Verified by Experts

The correct Answer is:

B

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