Let us consider the functions for u and v such that:[br] [img]https://latex.codecogs.com/gif.latex?u%28x%2Cy%29%3D2x-y%2C%20v%28x%2Cy%29%3Dx+y%5E2[/img][br]When we talk about how f changes, it is best to break this down into partial derivatives. What is f prime then?