(People who know how the first order part b was done please help)
I started integrating the normal way, with e2theta sin theta, then realised I couldn't do that so I looked and part a and realised I could use it. I didn't cross this part out - just tried another method.
I got to the point where I got two equations equating with r, p and q.
I then managed to get x in terms of r and t.
How many marks might I have gained??