Images 4X4 12X2Y 9Y2

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4x4 12x2y 9y2. Y²+XY-4x-9y+20=0. Y'-2xy=1-2x^2. X2+2xy+y2. �� = |𝑥 2 −9|..
Y²+XY-4x-9y+20=0. Y'-2xy=1-2x^2. X2+2xy+y2. �� = |𝑥 2 −9|..

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