$\operatorname{cosec} 48^{\circ}+\operatorname{cosec} 96^{\circ}+\operatorname{cosec} 192^{\circ}+\operatorname{cosec} 384^{\circ} = $

  • A
    $-2$
  • B
    $-1$
  • C
    $0$
  • D
    $\frac{\sqrt{3}}{2}$

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

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