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x 2 y 2 dx 2xy dy
dydx x 2 + y 2
xy-x 2 dy y 2dx
2xydx+ y 2-x 2 dy 0
x 2+y 2 dy xydx
dydx y 2xy-x 2
dydx+yx x 2y 2
dydx x 2+y 2+12xy
dydx y2x-y 2
2xydx+ x 2-1 dy 0
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