Ah so I was stuck on this question, basically the formatting is weird, they want aii, which is the tan(A-B) = pi/2 thing from before, and then you use that to simplify the tan2thetatana
I present to you this beautiful question from the 2010 hsc called the basel problem. Try it!
Very relevant for our exam, since they haven't done an integration question 16 since 2020 I believe. Maths does not really change that much syllabus wise, obvs there is stuff I skip but its maybe 2 or 3...
idk, It was at the top of the pile, im working forwards for chem backwards for latin since there are only 3 past papers and none for latin x and forwards for english