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验证微分方程(y%2xArCtAny/x)Dx%(x+2yArCtAny/x...

见图

dln√(x²+y²)=darctan(y/x) d(x²+y²)/[2(x²+y²)]=d(y/x)/[1+(y/x)²] (xdx+ydy)/(x²+y²)=[(xdy-ydx)/x²]/[1+(y/x)²] xdx+ydy=xdy-ydx dy/dx=(x+y)/(x-y)

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