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Sluppose a, b, c, in R and abc = i, if ...

Sluppose `a, b, c, in R ` and `abc = i, if A = [[3a, b, c ],[b, 3c, a ],[c, a, 3b]]` is such
that `A ^(T) A = 4 ^(1//3) I and abs(A) gt 0, ` the value of `a^(3) + b^(3) + c^(3)` is

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