Hi, My Complex Euler stuff is a bit rusty but I'm working on a problem (that I won't mention here) but I'm after an explanation as to how: Sin (theta) = 3.08 and so Cos (theta) = -i*2.91 What's throwing me is that I know Sin can only have a max at 1 trigonometrically (obviously) so I'm assuming 3 is something to do with like 3 rotations, but I could be wrong. I was also thinking like the 0.08 would be 4.6 degrees for theta. And I tried rearranging e^i*theata = CiS as e^i*theta - sin (theta) = -i*cos(theta) but that doesn't help. Any explanations? Thanks a lot!!