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xdy ydx x 2 y 2
dydx x 2 + y 2
y dx 2 x + y dy
dydx - y e x y 2
y 2dx+ x 2-xy+y 2 dy 0
y 2dx+ xy+x 2 dy 0
y 2dx xy-x 2 dy
ydx+ x-y 2 dy 0
dydx 2 x+y-2 x2 y
y 2dx+ x-1y dy 0
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