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[" If "(cos theta+cos2 theta)^(3)=cos^(3...

[" If "(cos theta+cos2 theta)^(3)=cos^(3)theta+cos^(3)2 theta" ,then the least positive value of "theta" is equal to - "],[[" (A) "(pi)/(6)," (B) "(pi)/(4)," (C) "(pi)/(3)]]

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