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How to integrate $x^{1/2}e^{-x}$ using integration by parts?

Answer should be $\left(-\sqrt{x} e^{-x}+(1/2)\sqrt{\pi} \mbox{erf}(\sqrt{x})\right)+c$

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    You can figure out what u and v were chosen from the first term of the answer, since you know what that is. That should get you closer.2011-02-22

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