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 Exercise

$\int x^3e^{-48x}\:dx$

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Final answer to the exercise  

$\frac{1}{-48}x^3e^{-48x}-\frac{1}{768}x^{2}e^{-48x}-\frac{1}{18432}xe^{-48x}-\frac{1}{884736}e^{-48x}$

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