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[" The value of "sin(pi)/(18)+sin(pi)/(9...

[" The value of "sin(pi)/(18)+sin(pi)/(9)+sin(2 pi)/(9)+sin(5 pi)/(18)" is given by "],[[" (A) "sin(7 pi)/(18)+sin(4 pi)/(9)," (B) "1],[" (C) ",cos(pi)/(6)+cos(3 pi)/(7)," (D) "cos(pi)/(9)+sin(pi)/(9)]]

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