InterviewSolution
`(X^(4))/(4)+(x^(3))/(3)+LOG(x+1)+C``(x^(4))/(4)-(x^(3))/(3)+log(x+1)+c``(x^(4))/(4)+(x^(3))/(3)+2log(x+1)+c``(x^(4))/(4)-(x^(3))/(3)+2log(x+1)+c`
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