$\cos(36^{\circ}-A) \cos(36^{\circ}+A) + \cos(54^{\circ}+A) \cos(54^{\circ}-A) = $

  • A
    $\cos(2A)$
  • B
    $\cos(A)$
  • C
    $\sin(2A)$
  • D
    $\sin(A)$

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