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

  • A
    $\pm \frac{\sqrt{p^2+q^2}}{2}$
  • B
    $\pm \frac{pq}{2}$
  • C
    $\pm \frac{p+q}{2}$
  • D
    $\pm \frac{\sqrt{p^2+q^2}}{4}$

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