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**what exactly means (∂^2/∂x ∂y) ??**

Not sure if I should post it here or in the homework section.

feel free to move the topic if necessary.

Due to some personal reasons I'm not attending college this semester. So I'm studying using the just books, which is kinda good but I have no one to ask questions (in person that is).

So I'm sorry if I make some trivial questions and all.

Anyways:

This is something that has been bothering me.

what exactly is [itex] \frac{\partial^2 f }{\partial x \partial y}[/itex] and what is it application.

what I don`t understand is:

when taking the first partial derivative you treat y as a constant and x as a variable.

then why is it that you do the opposite when taking the 2nd derivative?

What exactly does it represent?