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Evaluate: int(x^4)/(x^2+1)dx...

Evaluate: `int(x^4)/(x^2+1)dx`

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`I=int x^4/(x^2+1)dx`
`I=int (x4-1+1)/(x^2+1)dx`
`=int (x^4-1)/(x^2+1) dx+ int 1/(x^2+1)dx`
`int ((x)^2-(1)^2)/(x^2+1)dx+int 1/(x^2+1)dx`
...
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