I've spent a lot of time on it and I could only go so far. I think it's option 4, but I can't see how. Maybe I need to brush up on logarithms. Sorry I wasn't able to go till the end, but I spent 40 minutes on this, and I thought I might as well tell you what I've got, or it would be a wasted 40 minutes.
Hope this helps at least a little
Use trig identity:
I've just memorized the integrals of cosecant and secant, but they aren't too impossible to do.