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