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[" 19.The value of "cos(pi)/(11)+cos(3 p...

[" 19.The value of "cos(pi)/(11)+cos(3 pi)/(11)+cos(5 pi)/(11)+cos(7 pi)/(11)+],[cos(9 pi)/(11)" is "],[[" (A) "0," (B) "1],[" (C) "(1)/(2)," (D) None of these "]]

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