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If A = [(a, b, c), (b, c, a), (c, a, b)], abc = 1, A′A = I, then find maximum value of a^3 + b^3 + c^3.

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If A = [(a, b, c), (b, c, a), (c, a, b)], abc = 1, A′A = I, then find maximum value of a3 + b3 + c3.

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A′A = I. Therefore

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