>>10
Yes, then you can take this and graph it for all x in the complex plane. You'll see you end up with a unit circle where {x = your degrees = theta} and e^(ix) gives you a complex number that defines the vector from the origin to your point on the unit circle.
vector for a point on a circle in cartesian space = <cos(x), sin(x)>
vector for a point on a circle in complex space = <cos(x), (i)sin(x)>
The complex plane is just like the normal plane except instead of X and Y axis' you have real and imaginary axis'.
I can describe this in more detail if you wish, it's actually a pretty simple concept, I think. I'm just here because /b/ is down, so I don't know if I'll be coming back once it does.
>>5
No, at e^((i)(2pi)) you have a vector on the complex plane going from the origin to positive one on the real axis (it is the same as if you did e^((i)(0)) ). Therefore the value it gives out is '1 + 0i' or just '1'.