The Iterated Integral$\int _ { 0 } ^ { \pi } \int _ { 0 } ^ {\cos \theta } \int _ { 0 } ^{\sqrt { 1 - r ^ { 2 }} } r d z d r d \theta$

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The Answer of The Iterated Integral$\int _ { 0 } ^ { \pi } \int _ { 0 } ^ {\cos \theta } \int _ { 0 } ^{\sqrt { 1 - r ^ { 2 }} } r d z d r d \theta$

The Iterated Integral $\int _ { 0 } ^ { \pi } \int _ { 0 } ^ {\cos \theta } \int _ { 0 } ^{\sqrt { 1 - r ^ { 2 }} } r d z d r d \theta$