the issue is he wants to draw it in the domain 0 < x < 2pi, by using the same cos(x) curve shape, on the same axis length
something has to give somewhere
Well, honestly I think you can fudge your way through most essays without actually needing to have read the text in it's entirety
I mean like it's unfortunate that the HSC makes it possible and you will probably struggle to get full marks but it isn't impossible assuming you have decent writing...