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

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

A

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

B

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

C

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

D

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

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