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Evaluate: int(x^(3)/(x+1)^(2))dx...

Evaluate: `int(x^(3)/(x+1)^(2))dx`

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`intx^(3)/(x+1)^(2)dx=int(x^(3)+1-1)/(x+1)^(2)dx=int(x^(3)+1)/(x+1)^(2)dx-int(1/(x+1)^(2))dx`
`=int(x-2+3/(x+1))dx-int1/(x+1)^(2)dx=x^(2)/2-2x+3ln(x+1)+1/(x+1)+C`
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