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

[" 29.The value of "sum_(k=1)^(13)(1)/(((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-sqrt(3))]]

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