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y 2dx+ x 2-xy+y 2 dy 0
y dx 2 x + y dy
x 2+y 2 dy xydx
x 2+y 2 dydx xy
x x-y dy+y 2dx 0
dydx y 2xy-x 2
xdx x 2y-y 3 dy
ydx- x+2y 2 dy 0
y 2dx+ x-1y dy 0
xydx+ x 2+y 2 dy 0
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