Answer
\[
\int_{1}^{2} x^{3} d x
\]
Work Step by Step
\[
\int_{1}^{2} x^{3} d x
\]
Replace the sum with an integer sign with the limits $a$ and $b, \Delta x_{k}$ with $d x$, and $x_{k}^{*}$ with $x$.
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