I saw somewhere contains below formula. $${e^{ikr\cos \left( \theta \right)}} = \sum\limits_n {{i^n}{J_n}\left( {kr} \right){e^{ - in\theta }}} $$ I don't know if it is right. Does anyone know how to prove it? Or point to some references on this kind of expansions using bessel function?
2026-03-26 12:16:53.1774527413
expansion of exponential in terms of bessel function?
3.7k Views Asked by Bumbble Comm https://math.techqa.club/user/bumbble-comm/detail AtRelated Questions in BESSEL-FUNCTIONS
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