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xydx+ x 2+y 2 dy 0
ydx+ x-y 2 dy 0
x x+y dy x 2+y 2 dx
x 2+y 2 dy xydx
x+y 2dx+ 2xy+x 2-1 dy 0
ydx+ x 2-4x dy 0
y 2+x 2 dydx xy dydx
x+y 2dx+ 2yx+x2−1 dy 0
x-2y dx+2 y-x dy 0
y dxdy -x 2y 2
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