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Part by part integration method: ∫xe^(-x) dx = -∫x d[e^(-x)] = - x·e^(-x) + ∫e^(-x) dx = - x·e^(-x) - ∫e^(-x) d(-x) = - x·e^(-x) - e^(-x) + C =-(x+1)e^(-x)+C
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