- #1
shaun_chou
- 13
- 0
Homework Statement
Known formula:[tex]J_0(k\sqrt{\rho^2+\rho'^2-\rho\rho'\cos\phi})=\sum e^{im\phi}J_m(k\rho)J_m(k\rho')[/tex]
I can't derive to next equation which is [tex]e^{ik\rho\cos\phi}=\sum i^me^{im\phi}J_m(k\rho)[/tex]
Homework Equations
Can anyone help me? Thanks a lot!