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

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

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
a
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