$\frac{\cos 10^{\circ} + \cos 80^{\circ}}{\sin 80^{\circ} - \sin 10^{\circ}} = ?$

  • A
    $\tan 35^{\circ}$
  • B
    $\tan 55^{\circ}$
  • C
    $\tan 20^{\circ}$
  • D
    $\tan 70^{\circ}$

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