$\cos^2 48^\circ - \sin^2 12^\circ = $

  • A
    $\frac{\sqrt{5} - 1}{4}$
  • B
    $\frac{\sqrt{5} + 1}{8}$
  • C
    $\frac{\sqrt{3} - 1}{4}$
  • D
    $\frac{\sqrt{3} + 1}{2\sqrt{2}}$

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