$(\sin 80^{\circ} + \cos 10^{\circ})(\sin 80^{\circ} - \cos 10^{\circ}) = \ldots \ldots \ldots$

  • A
    $1$
  • B
    $2$
  • C
    $0$
  • D
    $\cos^{2} 10^{\circ}$

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