De Moivre 1 – Powerpoint – Proving De Moivre’s theorem and applications of De Moivre’s theorem
De Moivre 2 – Powerpoint – The exponential form of Complex numbers
De Moivre 3 – Powerpoint – Roots of unity
De Moivre 4 – Powerpoint – The nth root of a complex number
Roots of unity – Smart Notebook
Roots of unity in a complex plane – Wolfram Mathematica player – A lovely interactive visual. If you can’t download it, this Powerpoint might be the next best thing.
The videos below are by maths247