Chapter 10 - Parametric Equations and Polar Coordinates - 10.3 Exercises - Page 687: 11

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The region contains points whose distance from the origin is between 2 and 3 (arcs excluded), and terminal ends to the angles to these points are between $\displaystyle \theta=\frac{5\pi}{3}$ and $\displaystyle \theta=\frac{7\pi}{3}$, including the border line segments.