Solve the given ode..
x^2 (xdx+ydy)+y (xdy-ydx)=0
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see this post Solve first order ODE
it's not identical but it should be enough to get you through this problem.
Dear romsek can we make direct formula like d (xy) or something like that. ..
I have tried by dividing by x^2 then i got d (xy)+yd (y/x)=0..but i think
Now can't directly integrate this because y is there.. so what to do?