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[" The value of "sum_(k=1)^(13)(1)/(sin((pi)/(4)+((k-1)pi)/(6))sin((pi)/(4)+(k pi)/(6)))" is equal to "],[[" (A) "3-sqrt(3)," (B) "2(3-sqrt(3))," (C) "2(sqrt(3)-1)," (D) "2(2+4)]]

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