$\lim _{x \rightarrow 0} \frac{\sqrt{2}-\sqrt{1+\cos x}}{\sqrt{15+\cos 2x}-4} = $

  • A
    $-\frac{1}{\sqrt{2}}$
  • B
    $\frac{1}{\sqrt{2}}$
  • C
    $\sqrt{2}$
  • D
    $-\sqrt{2}$

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