If $\csc \theta = \frac{p + q}{p - q}$,then $\cot \left( \frac{\pi}{4} + \frac{\theta}{2} \right) = $

  • A
    $\sqrt{\frac{p}{q}}$
  • B
    $\sqrt{\frac{q}{p}}$
  • C
    $\sqrt{pq}$
  • D
    $pq$

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