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d/(dx)tan^-1((1-x)/(1+x))=...

`d/(dx)tan^-1((1-x)/(1+x))=`

A

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
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