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[" 3.If "cos^(3)theta+cos^(3)((2 pi)/(3)...

[" 3.If "cos^(3)theta+cos^(3)((2 pi)/(3)+theta)+cos^(3)((4 pi)/(3)+theta)=a cos3 theta," then "a=],[[" A) "(1)/(4)," B) "(3)/(4)," C) "(5)/(4)," D) "(7)/(4)]]

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