**collegedood rolled a random image posted in comment #8 at (untitled) **
That is because you converting from polar coordinates to rectangular in the complex plane!
As you see in my beautiful paint coordinate system, we have the imaginary part on the y-axis and the real part on the x-axis.
The polar system is a protocol to describe points in this coordinate system in the following form. re^i@
r being the length from the center to the point
e being eulers number
i being sqrt(-1)
@ being the angle from the real axis in radials.
Therefore e^ipi has a r of 1 and an angle of pi.
As you see in the picture, that leads to the point -1 on the real axis and 0 on the imaginary part.
e^i is not equal to negative pi, the rules for powers is not the same as the rules for multiplication.
e is a fundamental constant like pi
e=2,718
i is allso a constant like pi, exept it is imaginary.
i=SQROOT(-1)