Integrating cosec ^4 x wrt x

I was assigned some basic calculus revision questions to complete for an undergrad module…… been working on them for a while now, but I'm stuck at this. Any help would be appreciated; I'm not particularly bothered if you want to post the answers as it's not a piece of graded homework, besides I'm starting to get tired of these.

Student X

Please find the integral worked out as follows. Hope it helps. Peace.