I am working on a problem that goes
"Show that for a wave packet propagating in one dimension, for a free particle Hamiltonian"
m d<x^2>/dt = <xp> + <px>
What I think I want to do.
Use
d<A>/dt = i/hbar * <[H,A]>
Which leads me to
d<x^2>/dt = i/hbar * <[H,x^2]>
For the free...