A^2 + B^2 + C^2

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w e k n o w, {(a + b + c)}^{2} = a^{2} + b^{2} + c^{2} + 2 a b + 2 b c + 2 c a \Rightarrow a^{2} + b^{2} + c^{2} = {(a + b + c)}^{2} - 2 a b - 2 b c - 2 c a

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