$\lim _{x \rightarrow 1} \frac{\sqrt{x}-1}{(\cos ^{-1} x)^2} = $

  • A
    $-\frac{1}{4}$
  • B
    $\frac{1}{2}$
  • C
    $-\frac{1}{2}$
  • D
    $\frac{1}{4}$

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