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d/(dx)(tan^(- 1)(2/(x^(- 1)-x))) is equa...

`d/(dx)(tan^(- 1)(2/(x^(- 1)-x)))` is equal to

A

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
A
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