Q: I'm trying to solve the ff differential calculus question? It's pretty basic but I'm at a loss as to the concept Please, how do I go about this problem: d^2/dxdy (2x + 3y). How do I go about finding the derivative? Do I take the derivative of the function w.r.t to x then find the derivative of the answer w.r.t y?
In another example (which is my real problem) the function includes a z component, as in say, 2x + 3y + 2z. But it's the same d^2/dxdy that's operating on it. is the z component treated as  a constant so that by the first act of differentiation of x, for instance, it leaves the function. or is maintained?

A: Since I can't comment, I'm creating an answer. The answer to your question is yes. Maybe look up partial derivatives.
