LetE:=1/2(Tyxx+ ½ytt ) and P := Tyxyt.

Show thatEt = Px and TEx = ½Pt

and deduce thatE and P are also solutions of the wave equation, i.e.

TExx = ½Ett and TPxx = ½Ptt.

What are the physical interpretations ofE and P?

I am unsure of this, the physical interpretation of E and P.. are they the nodes?

many thanks