`(d)/(dx)tan^(-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:

A

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