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[" Q.21The value of the expression "(1+c...

[" Q.21The value of the expression "(1+cos(pi)/(10))],[(1+cos(3 pi)/(10))(1+cos(7 pi)/(10))(1+cos(9 pi)/(10))" is "],[[" (A) "(1)/(8)," (B) "(1)/(16)," (C) "(1)/(4)," (D) "0]]

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