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xdy-ydx+a x 2+y 2 dx 0
y x 2y+e x dx-e xdy 0
x 2dy+y x+y dx 0
x 2+xy dy x 2+y 2 dx
x 2-y 2 dx+ x 2-2xy dy 0
dydx x 2+xy+y 2 x 2
y-xy 2 dx- x+x 2y dy 0
xydx+ x 2+y 2 dy 0
x2dy+ xy+y2 dx 0
x 2-xy-y 2 0
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