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x 2 + y 2 + 3 dy dx 2x 2y − x 2 y
x 2 y 2 dx 2xy dy
x 2-xy+y 2 dx-xydy 0
2xydx+ y 2-x 2 dy 0
x 2+y 2+x dx+xydy 0
x 2dy+y x+y dx 0
x 2dydx+y 2 xy
xdy- y+2x2 dx 0
y-xy 2 dx- x+x 2y dy 0
x 2-y 2+y dx+x 2y-1 dy 0
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