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

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

A

`tan^(-1) x^(2)`

B

`x+tan^(-1) x`

C

`x-2 tan^(-1) x`

D

`log(1+s^(4))`

Text Solution

Verified by Experts

The correct Answer is:
C
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