I already know the answer to this, I'm just spreading it to the world. If you do not understand the concepts of i as the principal square root of -1, or the trigonometric sign cosine, you won't understand this. So, the question is: what is the cosine of i (in radians)? If you do find the answer, you will see why it is weird. If you find the answer, leave it as a(n) answer/comment. First one to answer wins.
