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`int_1^3(dx)/(x^2(x+1))`

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`int_1^3(dx)/(x^2(x+1))`
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Let `(1)/(x^(2)(x+1))=(A)/(x)+(B)/(x^(2))+(C )/(x+1)`. Then `Ax(x+1)+B(x+1)+Cx^(2)-=1`.
This, gives `A=-1`, `B=1`, `C=1`.
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