$\tan 20^\circ \tan 40^\circ \tan 60^\circ \tan 80^\circ = $

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

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यदि $A$ तीसरे चतुर्थांश में स्थित है और $3\tan A - 4 = 0$ है,तो $5\sin 2A + 3\sin A + 4\cos A = $

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