abs(a^2 +2b^2 -ac)/(a^2 +b^2)^1.5 , a = 2-sqrt(2), b = -sqrt(2), c = sqrt(2)abs(a^2 +2b^2 -ac)/(a^2 +b^2)^1.5 , a = 2-sqrt(2), b = -sqrt(2), c = sqrt(2)

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