∫ ( x n e x ) d x = x n e x − n ∫ ( x n − 1 e x ) d x {\displaystyle \int _{}^{}\left(x^{n}e^{x}\right)dx=x^{n}e^{x}-n\int _{}^{}\left(x^{n-1}e^{x}\right)dx}
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