A) \[\frac{1}{2\sqrt{2}}\]
B) \[\frac{1}{2\sqrt{3}}\]
C) \[\frac{1}{2}-\frac{1}{\sqrt{3}}\]
D) \[\frac{1}{2}-\frac{1}{\sqrt{2}}\]
E) None of these
Correct Answer: D
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