निश्चित समाकलन $\int_{0}^{\frac{\pi}{2}} \sin x \sin 2x \sin 3x \, dx$ का मान ज्ञात कीजिए:

  • A
    $\frac{1}{3}$
  • B
    $-\frac{2}{3}$
  • C
    $-\frac{1}{3}$
  • D
    $\frac{1}{6}$

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