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d/(dx)(cot^(-1)x)=?...

`d/(dx)(cot^(-1)x)=?`

A

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

B

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

C

`1/(1+x)`

D

`1/(1+x)`

लिखित उत्तर

Verified by Experts

The correct Answer is:
B
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