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Question
If $$a = \frac{{\sqrt 3 }}{2}{\text{,}}$$   then $$\sqrt {1 + a} + \sqrt {1 - a} = ?$$
Options:
A .  $$\left( {2 - \sqrt 3 } \right)$$
B .  $$\left( {2 + \sqrt 3 } \right)$$
C .  $$\left( {\frac{{\sqrt 3 }}{2}} \right)$$
D .  $$\sqrt 3 $$
Answer: Option D

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