Ok So I'm doing some quantum questions and i have:
psi = Ae^i(kz-wt) + Be^-i(kz+wt).
How can i write this as a single exponential in the form psi = |psi| e^ i theta?
The Attempt at a Solution
Not sure really..
I guess |psi| = |A+B| ?
how do i get an expression for e^itheta?