Question \( \int_{-3 \pi}^{3 \pi} \sin ^{2} \theta \sin ^{2} 2 \theta d \theta \) is equal to \(....

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\( \int_{-3 \pi}^{3 \pi} \sin ^{2} \theta \sin ^{2} 2 \theta d \theta \) is equal to \( \frac{n \pi}{2}(n \in N) \) then \( n \) is equal to


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