यदि $\cos x + \cos y = -\cos \alpha$ और $\sin x + \sin y = -\sin \alpha$ है,तो $\cot \left(\frac{x+y}{2}\right) = $

  • A
    $-\cot \alpha$
  • B
    $\cot \alpha$
  • C
    $-\tan \alpha$
  • D
    $\tan \alpha$

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