int((x^(2)-1))/((x^(2)+1)sqrt(x^(4)+1))d...

`int((x^(2)-1))/((x^(2)+1)sqrt(x^(4)+1))dx` is equal to

A

`sec^(-1)((x^(2)+1)/(sqrt2x))+c`

B

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

C

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

D

none of these

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