$\lim _{x \rightarrow \pi} \frac{1-\sin (x/2)}{\left(\cos \frac{x}{2}\right)\left(\cos \frac{x}{4}-\sin \frac{x}{4}\right)} =$

  • A
    $\frac{3}{\sqrt{2}}$
  • B
    $\frac{-1}{\sqrt{2}}$
  • C
    $\frac{1}{\sqrt{2}}$
  • D
    $\frac{5}{\sqrt{2}}$

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