InterviewSolution
`x TAN^(-1) ((x^(2)+1)/(x))``tan^(-1)((x^(2)-1)/(x))``(1)/(sqrt(2)) tan^(-1)((x^(2)+1)/(sqrt(2x)))``(1)/(sqrt(2)) tan^(-1)((x^(2)-1)/(sqrt(2x)))`
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