If int (dx)/(x ^(4) (1+x^(2)))=a ln |(1+...

If `int (dx)/(x ^(4) (1+x^(2)))=a ln |(1+x ^(3))/(x ^(3))| +(b)/(x ^(3)) +(c)/(1+ x^(2)) +d.` then (where d is arbitrary constant)

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

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

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

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

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