Alright from this equation y=3cos(2(x-120degrees))-3
I have the rule (.5x+120, 3y-3) is that what you have?
then with a cosine funtion you start on the y-axis at point (0,1) and then you move to (90, 0) then to (180, -1) then to (270, 0) then to (360, 1) correct? so what you are correct...