For the last question how many marks do you think I would get,
I squared everything to get sin^2ax=3cos^2ax
Then used the identies to get 1-cos^2ax=3cos^2ax
Then rearranged to get 4cos^2ax=1 ,then cos^2ax=1/4
then square rooted to get cosax=+ or - 1/2
Then somehow I ended up with pi/3a and 2pi/3a as my final answer.
Thanks very much