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yep i get it now, thanksinsert-username said:You get them from your unit circle - When sin theta = √3/2, theta could be 60 degrees or 120 degrees (since sin is your y-value). But because your final angle is multiplied by two, you need to go around the circle once more - when you halve 420 degrees and 480 degrees, you get two results that are below 360.
It's a little hard to explain without a diagram, but I hope that helps out.
I_F