Answer
$\frac{3\pi^2}{2}$
Work Step by Step
Because $\pi\lt2\pi$, by Equation (2): $\int_{\pi}^{2\pi} \theta d\theta=\frac{(2\pi)^2}{2}-\frac{(\pi)^2}{2}=\frac{4\pi^2}{2}-\frac{\pi^2}{2}=\frac{3\pi^2}{2}$
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