Y 4x 2xy 0. Dy/dx = −2xy/( x^2+y^2). 2xy(dy/dx)-y^2+x=0. (xy+x) dx/dy =1. y2 dx + x2 dy = xy dy, y ( 1 ) = 1..

Y 4x 2xy 0. Dy/dx = −2xy/( x^2+y^2). 2xy(dy/dx)-y^2+x=0. (xy+x) dx/dy =1. y2 dx + x2 dy = xy dy, y ( 1 ) = 1..
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