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x 2 y ′′ + xy′ + y 0
x 2-xy-y 2 0
y ′′ + 2y ′ + y 0
x 2 - y 2
x 2-y 0
x 2-y 2 0
xy′′ + y ′ e x 1 + x
x 2-xy-y 2
x 2+y 2-xy 0
x-y 2 x
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