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