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xdy ydx x 2 y 2
x 2ydx-xy 2dy
ydx-xdy x 2ydy
x 2+y 2 dy xydx
x 2 xdx+ydy +2y xdy-ydx 0
xydx+ x 2+y 2 dy 0
y 2+x 2dydx xydydx
x 2dydx+y 2 xy
2ydx+xdy
xdy-ydx+a x 2+y 2 dx 0
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