यदि $x=\frac{\sqrt{3}+1}{\sqrt{3}-1}$ और $y=\frac{\sqrt{3}-1}{\sqrt{3}+1}$ है,तो $(x^{2}+y^{2})$ का मान ज्ञात कीजिए।

  • A
    $10$
  • B
    $13$
  • C
    $14$
  • D
    $15$

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