यदि $\cos x = \frac{2 \cos y - 1}{2 - \cos y}$ जहाँ $x, y \in (0, \pi)$,तो $\tan(x/2) \cot(y/2) =$

  • A
    $\sqrt{2}$
  • B
    $\sqrt{3}$
  • C
    $1/\sqrt{2}$
  • D
    $1/\sqrt{3}$

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