Integrate (xe^x)/(sqrt[1+e^x])

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SUMMARY

The integral of the function (xe^x)/(sqrt[1+e^x]) can be simplified using the substitution u = sqrt(1 + e^x). This substitution transforms the integral into a more manageable form, allowing for further analysis and solution. Initial attempts using u = e^x and other methods such as trigonometric substitution and partial fractions proved ineffective. The key to solving this integral lies in recognizing the appropriate substitution that simplifies the expression significantly.

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Homework Statement


Integrate: (xe^x)/(sqrt[1+e^x])


Homework Equations





The Attempt at a Solution



I tried substituting

u = e^x

So the equation became:

Integrate: ln|u|/sqrt[1+u]

But... That doesn't help me.



Trig substitution doesn't really help, neither does partial fractions. By parts doesn't work because of the fraction... So there's GOT to be a substitution I can't see.
 
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Try u = \sqrt{1 + e^{x}}
 

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