Describe the Region Whose Area Is Given by the Integral$\int _ { 0 } ^ { \pi / 4 } \int _ { 0 } ^ { \cos 2 \theta } 2 r d r d \theta$

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The Answer of Describe the Region Whose Area Is Given by the Integral$\int _ { 0 } ^ { \pi / 4 } \int _ { 0 } ^ { \cos 2 \theta } 2 r d r d \theta$

Describe the Region Whose Area Is Given by the Integral $\int _ { 0 } ^ { \pi / 4 } \int _ { 0 } ^ { \cos 2 \theta } 2 r d r d \theta$