$\sqrt{2+\sqrt{2+\sqrt{2+2 \cos 8 \theta}}} = $

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

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$(4 \cos^2 9^{\circ} - 3)(4 \cos^2 27^{\circ} - 3) = $

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