Complex Numbers
IMPORTANT You will need to have a WolframAlpha Pro account to use Wolfram effectively.
Wolfram has it’s own documentation.
Displaying
Simply typing your complex number into Wolfram will give you all kinds of useful information about it, including displaying it on an Argand diagram and polar representation.
Calculations
Doing complex number calculations really is as simple as typing them in. Wolfram will try to give you as much information as possible - including the answer both as cartesian and polar coordinates.
Complex Roots
Wolfram will apply De Moivre’s theorem to find complex roots. All you have to do is type the equation in. The solution is visualized in the complex plane.