# Integrating sin(x) exp(sin(x))

1. ### james7henderso

1
Hello Physics Forum,

I am trying to find an analytic solution to an equation of the form ∫sin(x/a) exp(b sin(x/a)) dx. I have tried integration by parts and all the usual tricks but can't seem to get anywhere

James

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3. ### JJacquelin

779
You can express the undefined integral on the form of an infinite series, but not on a closed form with the elementary and current special functions.