Re: HSC 2014 4U Marathon
What I just put it in mod arg form :S but where did you get cos(7pi/12) from wtfYes the version in the form (a+ib) is correct, how did you get the De Moivere's theorem version from that though?
As far as how to get cos(pi/24) is concerned, you need to find how to get from cos(7pi/12) to cos(pi/24)