2ydx+x(x^2lny-1)dy=0
2yx3dx+(lny−1x2)dy=0d(−yx2)+lnydy=0d(−yx2+ylny−y)=0−yx2+ylny−y=Const\frac{2y}{x^3}dx+\left( \ln y-\frac{1}{x^2} \right) dy=0\\d\left( -\frac{y}{x^2} \right) +\ln ydy=0\\d\left( -\frac{y}{x^2}+y\ln y-y \right) =0\\-\frac{y}{x^2}+y\ln y-y=Constx32ydx+(lny−x21)dy=0d(−x2y)+lnydy=0d(−x2y+ylny−y)=0−x2y+ylny−y=Const
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