यदि $\sin x + \sin y = \frac{\sqrt{3}+1}{2}$ और $\cos x + \cos y = \frac{\sqrt{3}-1}{2}$ है,तो $\tan^2 \left(\frac{x-y}{2}\right) + \tan^2 \left(\frac{x+y}{2}\right) = $

  • A
    $8+4 \sqrt{3}$
  • B
    $6+4 \sqrt{3}$
  • C
    $3+\sqrt{3}$
  • D
    $12+6 \sqrt{3}$

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