-sin(xy)[ydx+xdy]=2xy^2*dx+x^2*2ydy
-sin(xy)ydx-sin(xy)xdy=2xy^2*dx+2x^2*ydy
-2x^2*ydy-sin(xy)xdy=2xy^2*dx+sin(xy)ydx
-[2x^2*y+sin(xy)x]dy=[2xy^2+sin(xy)y]dx
dy/dx=-[2xy^2+sin(xy)y]/[2x^2*y+sin(xy)x]
-sin(xy)[ydx+xdy]=2xy^2*dx+x^2*2ydy
-sin(xy)ydx-sin(xy)xdy=2xy^2*dx+2x^2*ydy
-2x^2*ydy-sin(xy)xdy=2xy^2*dx+sin(xy)ydx
-[2x^2*y+sin(xy)x]dy=[2xy^2+sin(xy)y]dx
dy/dx=-[2xy^2+sin(xy)y]/[2x^2*y+sin(xy)x]