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(x^4+1)/(x(x^2+1)^2)dx=Aln|x|+B/(1+x^2)+...

`(x^4+1)/(x(x^2+1)^2)dx=Aln|x|+B/(1+x^2)+C ,`

A

`A=1`, `B=-1`

B

`A=-1`, `B=1`

C

`A=B=1`

D

`A=B=-1`

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