$\frac{4 \sin 9^{\circ} \sin 21^{\circ} \sin 39^{\circ} \sin 51^{\circ} \sin 69^{\circ} \sin 81^{\circ}}{\sin 54^{\circ}}$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{16}$
  • B
    $\frac{1}{32}$
  • C
    $\frac{1}{8}$
  • D
    $\frac{1}{4}$

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