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

A

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

B

0

C

`logabs((x^(2)+1)/(x^(4)+1))+c`

D

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

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The correct Answer is:

A

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