Let f(x) = x^3/6 + 6 + 1/2x. Calculate the arc length of the graph of f(x) over the interval [2, 4]. Enter an exact answer.

Let f(x) = x^3/6 + 6 + 1/2x. Calculate the arc length of the graph of f(x) over the interval [2, 4]. Enter an exact answer.

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Let f(x) = x^3/6 + 6 + 1/2x. Calculate the arc length of the graph of f(x) over the interval [2, 4]. Enter an exact answer.

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