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

1. Jan 15, 2014

### james7henderso

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

2. Jan 15, 2014

### JJacquelin

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.