A calculus of the absurd

15.2.3 Polar co-ordinates and complex numbers
We can also define complex numbers differently (i.e. not using Cartesian co-ordinate system). Instead of identifying each complex number using an \(x\) (real) and \(y\) (imaginary) co-ordinate, we can instead define it using an angle (\(\theta \)) and a distance from the origin (\(r\)).