ReplaceAll[C^2-4CB+2B^2+(B+1)^4/C^2, {B -> 1/11(-6+(11sqrt(33)-63)^(1/3)/3^(2/3)-2/(3 (11sqrt(33)-63))^(1/3)), C -> (1/33 (-13+(2654 - 462sqrt(33))^(1/3) + (2(1327+231sqrt(33)))^(1/3)))}]

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