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## Homework Statement

w= f(x,y)

x = u + v Verify that Wxx - Wyy = Wuv

y = u - v

## Homework Equations

## The Attempt at a Solution

I know how to find Wu or Wv but I have no idea on how to proceed to find the 2nd order derivative (or 3rd,4rth etc.. obviously). I assume this somehow uses the chain rule but I had no idea on how to apply it in this situation. Thank you!