Show that (int_{0}^{infty} x^{n} e^{-x} d x=n) ! for all (n in mathbb{N}). [ Show that (int_{0}^{infty}
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Show that \(\int_{0}^{\infty} x^{n} e^{-x} d x=n\) ! for all \(n \in \mathbb{N}\).
[ Show that \(\int_{0}^{\infty} e^{-x t} d x=1 / t, t>0\), and differentiate this identity.]
[ Show that \(\int_{0}^{\infty} e^{-x t} d x=1 / t, t>0\), and differentiate this identity.]
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