InterviewSolution
`1/(sqrt(E^(2x) + 4e^(x) + 5))``(e^x)/(sqrt(e^(2x) + 4e^(x) + 5))``(e^x)/(sqrt(e^(2x) + 4e^(x) + 3))``(-e^x)/(sqrt(e^(2x) + 4e^(x) + 3))`
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