$\sin 60^{\circ} \sin 45^{\circ} + \cos 60^{\circ} \cos 45^{\circ} = \ldots \ldots \ldots \ldots$

  • A
    $\sqrt{3} + 1$
  • B
    $\frac{\sqrt{3} + 1}{2}$
  • C
    $\frac{\sqrt{6} + \sqrt{2}}{4}$
  • D
    $\frac{1}{2}$

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