$\tan 4^{\circ} \tan 43^{\circ} \tan 47^{\circ} \tan 86^{\circ}$ का मान ज्ञात कीजिए।

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

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