$\sqrt{2+\sqrt{2+2 \cos 4 \theta}} = $

  • A
    $2 \cos \theta$
  • B
    $\frac{\cos \theta}{2}$
  • C
    $\frac{\cos \theta}{\sqrt{2}}$
  • D
    $\sqrt{2} \cdot \cos \theta$

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

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