7. Find the arc length of the graph of $y = \frac{1}{6}x^3 + \frac{1}{2x}$ on the interval $\left[\frac{1}{2}, 2\right]$
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7. Find the arc length of the graph of $y = \frac{1}{6}x^3 + \frac{1}{2x}$ on the interval $\left[\frac{1}{2}, 2\right]$