# Homework Help: Second Partial Derivative Test

1. Oct 13, 2008

### cse63146

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

2. Oct 13, 2008

### HallsofIvy

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