Hi there,

If I have a complex number z = 1 + root(3)i

Then changing it to polar form is z = r cis(11pi/6)

But my book does mention that the angle must lie between –pi and pi.

Using logic from circular trigonometry 11pi/6 = -pi/6

Therefore in polar form z = r cis(-pi/6) and not r cis(11pi/6) ?

What does this restriction on the angle represent?