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[" Q.7The value of "cos(pi)/(7)+cos(2 pi...

[" Q.7The value of "cos(pi)/(7)+cos(2 pi)/(7)+ca],[cos(5 pi)/(7)+cos(6 pi)/(7)+cos(7 pi)/(7)" is- "],[[" (A) "1,=(B)-1],[" (C) "1/2," (D) "0]]

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