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int (dx)/(x^4(1+x^3)^2)=aln|(1+x^3)/x^3|...

`int (dx)/(x^4(1+x^3)^2)=aln|(1+x^3)/x^3|+b/x^3+c/(1+x^3)+d` then

A

`a=1/3 , b=1/3 , c=1/3`

B

`a=2/3 , b=-1/3 , c=1/3`

C

`a=2/3 , b=-1/3 , c=-1/3`

D

`a=2/3 , b=1/3 , c=-1/3`

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