Hi all,

I am in the process of working out a solution to a 2nd order PDE.

However I am stuck on calculating given that

and and

I can calculate uxx which is

and uy,uxx and uyy etc however I get stuck on uxy. I just cant get the answer in the book which leads me to belive my uxy is wrong. Can anyone give me a start on this uxy derivation like above for uxx?

Thanks