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dydx-2x 2xy y 1 0
xdx + y − 2x dy 0
2xydx+ x 2-1 dy 0
2xydx+ y 2-x 2 dy 0
x 2 y 2 dx 2xy dy
y 2dx+ x-1y dy 0
2xydx+ x 2-y 4 dy 0
ydx+ xy+2x-ye y dy 0
y 6y 2-x-1 dx+2xdy 0
dydx x 2+y 2+12xy
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