InterviewSolution
`(X)/(2)sqrt(1+x^(2))+(1)/(2)log|(x+sqrt(1+x^(2)))|+C``(2)/(3)(1+x^(2))^((3)/(2))+c``(2)/(3)x(1+x^(2))^((3)/(2))+c``(x^(2))/(2) sqrt(1+x^(2))+(1)/(2)x^(2) log|x+ sqrt(1+x^(2))|+c`
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