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int d^(2)/(dx^(2))(tan^(-1) x) dx =...

`int d^(2)/(dx^(2))(tan^(-1) x) dx =`

A

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

B

`tan^(-1)x`

C

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

D

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

Text Solution

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The correct Answer is:
A
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