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x 2 dydx x 2-2y 2+xy
dydx x 2-y 2 xy
dx x 2-xy+y 2 dy 2y 2-xy
x 2+xy dy x 2+y 2 dx
xy-x 2 dy y 2dx
x 2+y 2 dydx xy
dydx+yx x 2y 2
x 2 y 2 dx 2xy dy
x 2-dy 2 1
x dydx - y x 2
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