यदि $\cos x+\cos y+\cos \alpha=0$ और $\sin x+\sin y+\sin \alpha=0$ है,तो $\cot \left(\frac{x+y}{2}\right)$ का मान ज्ञात कीजिए।

  • A
    $\sin \alpha$
  • B
    $\cos \alpha$
  • C
    $\tan \alpha$
  • D
    $\cot \alpha$

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