Second Partial Derivative Test

[cse63146]

I just need to know what is/how to computer $$\frac{\partial f}{\partial x \partial y}$$

 

[HallsofIvy]

Do you know how to find [tex]\frac{\partial y}{\partial x}[/itex]? To find the second derivative, just do it <b>again</b>: differentiate again whatever function you get from the first derivative.[/tex]