$\int_{-3\pi}^{3\pi} \sin^2 \theta \sin^2 2\theta \, d\theta$ का मान ज्ञात कीजिए।

  • A
    $3\pi$
  • B
    $\frac{3\pi}{2}$
  • C
    $\frac{5\pi}{2}$
  • D
    $6\pi$

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