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Question
If $$x = \frac{{\sqrt 3 + 1}}{{\sqrt 3 - 1}}$$   and $$y = \frac{{\sqrt 3 - 1}}{{\sqrt 3 + 1}},$$   then the value of $$\left( {{x^2} + {y^2}} \right)$$   is?
Options:
A .  10
B .  13
C .  14
D .  15
Answer: Option C

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