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Question
If $$2\sin \left( {\frac{{\pi x}}{2}} \right) = {x^2} + \frac{1}{{{x^2}}}{\text{,}}$$     then the value of $$\left( {x - \frac{1}{x}} \right)$$   is?
Options:
A .  -1
B .  2
C .  1
D .  0
Answer: Option D

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