Hi there. I'm really confused with this question, it's about the unit circle. Firstly I was asked to look up the values of (sorry I don't know how to put in the symbol for PI-3.14) 'cos(PI/3)' and 'sin(PI/3)' ok I got them. Then I'm told to use the unit circle diagrams (diagrams?) to show the connection between: cos(2PI/3), sin(2PI/3) and cos(PI/3), sin(PI/3) (Then again for cos(4PI/3), sin(4PI/3) and cos(PI/3), sin(PI/3) What is confusing me is the 'sin' and 'cos'! I don't understand where they fit into the unit circle?? I can find 2PI/3 on the unit circle, but how do I know if it is for sin or cos?? And by connection, I firstly thought, 'Ok, PI/3 and 2PI/3 are basically both 60degrees from the positive y axis' but then that isn't right because I haven't considered cos or sin! If someone could point me in the right direction, it would be a huge relief!