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Evaluate the indefinite integral.

$\displaystyle \int{x}^{{3}}{e}^{{{x}^{{4}}}}{\left.{d}{x}\right.}$

+ C

Consider how the natural exponential function

\displaystyle {e}^{{x}}

relates to its derivative. Look for a substitution involving the exponent of e that might simplify this integral.

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\displaystyle

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