$\mathop {\lim }\limits_{x \to 0} \frac{{\sqrt {1 + \sin x} - \sqrt {1 - \sin x} }}{x} = $

  • A
    $-1$
  • B
    $1$
  • C
    $2$
  • D
    $-2$

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$\mathop {\lim }\limits_{x \to 0} \frac{{\log \cos x}}{x} = $

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