Solving Several Integrals Homework

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SUMMARY

The discussion focuses on solving the integral \(\int\frac{xdx}{\sqrt{1-x}}\). The original poster attempted various methods, including multiplying by the conjugate and using trigonometric substitution, but encountered difficulties. A suggested solution involves the substitution \(u = 1-x\), which simplifies the integral into the sum of two trivial integrals. This approach provides a clear path to the solution.

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Homework Statement


[tex]\int[/tex][tex]\frac{xdx}{\sqrt{1-x}}[/tex]


Homework Equations



n/a

The Attempt at a Solution


I tried to multiple top and bottom by the conjugate:
[tex]\int[/tex][tex]\frac{x\sqrt{1+x}dx}{\sqrt{1-x^{2}}}[/tex]

I tried trig substitution and u-substitution, but nothing seems to work.

I end up with -[tex]\int[/tex]cos[tex]\theta[/tex][tex]\sqrt{1+cos\theta}[/tex]

Can anyone help me out on this? And show steps, please? Thanks so much!
 
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If you make a substitution u = 1-x (then x = 1-u), you now have the sum of two trivial integrals.
 
thank you so much! oh, and sorry about the double post
 

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