5m Zen
X2 y2 2 4xy
X2 y2 2 4xy pictures 5
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X2 y2
X2 y2 2 4xy
x y 2 4xy x2 y2
x2(y2+2y+2)+y 2-4xy+2x-4yu003d0
x2 y2 2 4xy
