If int (x ^(4) + x ^(2) + 1 )/(x ^(2) +1...

`If int (x ^(4) + x ^(2) + 1 )/(x ^(2) +1) dx = (x ^(3))/( 3) + f (x) +C,` then `f (1) = `_____

A

0

B

`(pi)/(4)`

C

`(pi)/(2)`

D

`(1)/(2)`

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