Hello

problem:

Solve : $\displaystyle y^2(1-x^2)dx+x(x^2y+2x+y)dy=0$

It must be solved using inspection

which is $\displaystyle ydx+xdy=d(xy)$ , $\displaystyle ydx-xdy=y^2d\left(\dfrac{x}{y}\right)$ ... etc

But this equation is bothering me

I tried as much I can, and it seems impossible!

any help??