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If `A_(1)A_(2)A_(3)A_(4)A_(5)` be regular pentgon inscribed in anunit circle. Then `(A_(1)A_(2))(A_(1)A_(3))` is equal to

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If `A_(1)A_(2)A_(3)A_(4)A_(5)` be regular pentgon inscribed in anunit circle. Then `(A_(1)A_(2))(A_(1)A_(3))` is equal to
A. 1
B. 3
C. 4
D. `sqrt5`
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Correct Answer - D
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