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Do it by parts. Int(u.dv) = u.v - int(v.du)

Let x = u, then dx = du. Let e^x = dv, then v = e^x.

Plug into formula: xe^x - int(e^x.dx)

= x.e^x - e^x or e^x(x-1)+C

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Q: How do you intergrate xe power x?
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