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int(x^(2)-1)/(xsqrt(x^(4)+3x^(2)+1))dx=...

`int(x^(2)-1)/(xsqrt(x^(4)+3x^(2)+1))dx=`

A

`log|(x^(2)+1+sqrt(x^(4)+3x^(2)+1))/(x)|+C`

B

`log|(x+1+sqrt(x^(2)+3x+1))/(x)|+C`

C

`log|(x^(2)+1+sqrt(x^(2)+1))/(x^(2))|+C`

D

`tan^(-1)x+C`

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