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xdy ydx x 2 y 2
ydx- x+2y 2 dy 0
ydx+ x-y 2 dy 0
dydx+yx x 2y 2
y 2dx xy-x 2 dy
x 2+y 2 dy xydx
dydx x 2 + y 2
y 2dx+ xy+x 2 dy 0
y 2dx+ x 2-xy+y 2 dy 0
ydx+ x 2-4x dy 0
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