What explanation of what "sin theta" means did you find the most helpful?
I know this comment is correct, but it's also a little frustrating because my students who struggle the most often quail at the moments when I try to share multiple paths -- "just show us how to do the problem!"
(No.)
I have found that for such students getting their peers to share can be very effective. Though, this can eat up time-- but it can be worth it.