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x 2 y 2 dx 2xy dy
y 2dx+ x 2-xy-y 2 dy 0
y 2dx xy-x 2 dy
y 2dx+ x-1y dy 0
y 2-2xy+6x dx- x 2-2xy+2 dy 0
x x-y dy+y 2dx 0
4y+yx 2 dy- 2x+xy 2 dx 0
dx x 2-y 2 dy -2xy
x+y 2dx+ 2yx+x2−1 dy 0
x-2y dx+ 2x+y dy 0
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