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y 2dx+ x 2-xy-y 2 dy 0
y dx 2 x + y dy
x 2+y 2 dy xydx
dydx x 2-y 2 xy
xy dydx x 2+y 2
x x-y dy+y 2dx 0
dydx y 2xy-x 2
y 2+x 2 dydx xy dydx
y 2dx+ x-1y dy 0
xydx+ x 2+y 2 dy 0
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