જો $\cos x + \cos y + \cos \alpha = 0$ અને $\sin x + \sin y + \sin \alpha = 0$ હોય,તો $\cot \left( \frac{x + y}{2} \right) = $

  • A
    $\sin \alpha $
  • B
    $\cos \alpha $
  • C
    $\cot \alpha $
  • D
    $\sin \left( \frac{x + y}{2} \right)$

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