[" The value of "sum(k=1)^(13)(1)/(sin((...

[" The value of "sum_(k=1)^(13)(1)/(sin((pi)/(4)+((k-1)pi)/(6))sin((pi)/(4)+(k pi)/(6)))" is equal "],[" (a) "3-sqrt(3)quad " (b) "2(3-sqrt(3))quad " (c) "2(sqrt(3)-1)quad " (d) "2(2+sqrt(3))]

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