$\tan 81^{\circ}-\tan 63^{\circ}-\tan 27^{\circ}+\tan 9^{\circ}$ का मान ज्ञात कीजिए।

  • A
    $6$
  • B
    $0$
  • C
    $2$
  • D
    $4$

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$\sin 36^\circ \sin 72^\circ \sin 108^\circ \sin 144^\circ = $

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