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expand (12(u^2 - u v + v^2))^3 - 432 (u^3+v^3)^2 - (36 (u-v) (u^2 - u v + v^2))^2
expand (12(u^2 - u v + v^2))^3 - 432 (u^3+v^3)^2 - (36 (u-v) (u^2 - u v + v^2))^2
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