I need to show that given f(x+y, x^2 + xy + z^2)=0 then this equals a manipulation of this in terms of partial derivatives etc.
I believe this is something to do with change of variables i.e. let u=x+y and let v=x^2+xy+z^2 then plugging this into the total differential equation. I'm just a little stuck...
I believe this is something to do with change of variables i.e. let u=x+y and let v=x^2+xy+z^2 then plugging this into the total differential equation. I'm just a little stuck...