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

[" 10.The value of "cos(pi)/(19)+cos(3 pi)/(19)+cos(5 pi)/(19)+......+cos(17 pi)/(19)" is equal to "],[[" (A) "1/2," (B) "0," (C) "1," (D) None of these "]]

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