$\mathop {\lim }\limits_{x \to \pi /4} \frac{{\sqrt 2 \cos x - 1}}{{\cot x - 1}} = $

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

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