9. Find the arc length of the graph of the function \( y = \frac{x^3}{6} + \frac{1}{2x} \) over the interval \( [\frac{1}{2}, 2] \). (10%)
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9. Find the arc length of the graph of the function \( y = \frac{x^3}{6} + \frac{1}{2x} \) over the interval \( [\frac{1}{2}, 2] \). (10%)