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- ...+ \sqrt{6 - 6x^2 - 14 y^2 - 18 xy}, g(x,y) = y - \sqrt{6 - 6x^2 - 14 y^2 - 18 xy}.</math> <cmath>6 - 6x^2 - 14 y^2 - 18 xy = 6 - 6 \left(x^2 + 3xy + \frac {9}{4} y^2\right) + \frac {6 \cdot 9}{4}48 KB (8,214 words) - 07:59, 30 July 2024