# Integral of dx^2

1. Apr 3, 2009

### zmike

1. The problem statement, all variables and given/known data

Integral of dx^2 =?

3. The attempt at a solution

Because I can't take the derivative of dx ?

thanks

2. Apr 3, 2009

### Dr.D

I think you have a notationally ill-defined problem here. Just what do you think this means?

3. Apr 3, 2009

### HallsofIvy

Are you thinking of something like $d^2y/dx^2= 1/y$ so $y d^2y= dx^2$?

You can't do that! A first derivative can only be "separated" by first defining the "differentials" dx and dy separately. That cannot be done for a second derivative.