I am suppose to make a substitution and then solve by parts but I can't seem to do anything with it that makes sense.
$\int e^{\cos t}\sin 2t\,dt$
I rewrote as $2e^{\cos t}\sin t\cos t$ and attempted to use u substitution but I end up with
$-2 \int e^{\cos t}{\cos t\,dt}$ and from here I do not know what to do, nothing seems to improve the problem