1. The problem statement, all variables and given/known data I have two operators A^2B^2+B^2A^2 1/2(A^B^+B^A^) 2 By what factor do the two operators differ? 3. The attempt at a solution I believe I either have to find the inner products of them and relate them somehow or use commutation? Not sure which one! I dont want help with the maths as I really need to try figure that bit out myself! But im not quite sure what the question is asking me to do.