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int((x^(2) +1))/(x^(4) + 7x^(2) + 1) dx ...

`int((x^(2) +1))/(x^(4) + 7x^(2) + 1) dx =`

A

`(1)/(3) tan^(-1) ((x^(2) - 1)/( 3x) ) + c `

B

`tan^(-1) ((x^(2) - 1)/( 3x) ) + c `

C

`(1)/(3) tan^(-1) ((x^(2) - 1)/( 3x) ) + c `

D

`(1)/(sqrt(3)) tan^(-1) ((x^(2) - 1)/( 3x) ) + c `

Text Solution

Verified by Experts

The correct Answer is:
A
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