What is the Antiderivative of a Complex Square Root Function?

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SUMMARY

The antiderivative of the function sqrt[e^x + ln(x^2) + 1] cannot be expressed in terms of elementary functions. The attempted solution involving (2[(e^x + ln(x^2) + 1)^(3/2)]x^2)/[3(e^x + 2x)] is incorrect due to the integration method applied. Specifically, the integration of u^{1/2} as (3/2)u^{3/2} is valid only when u is linear, which is not the case here. Therefore, alternative methods or numerical approaches may be necessary for evaluation.

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Homework Statement



Antiderivative of sqrt[e^x+ln(x^2)+1]

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The Attempt at a Solution



(2[(e^x+ln(x^2)+1)^(3/2)]x^2)/[3(e^x+2x)]
 
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No, that is incorrect and I don't think this can by integrated in terms of elementary functions. What you have done, integrating [itex]u^{1/2}[/itex] as [itex](3/2)u^{3/2}[/itex] and then dividing by the derivative of u, can only be done if u is linear so that u' is a constant. Constants can be "moved" inside and outside of an integral. functions of the variable of integration cannot.
 

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