Complex numbers and beautiful derivations of ugly formulas
Channel: Mirek Olšák
Date: 2017-07-23

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An English version of a previously uploaded Czech video https://www.youtube.com/watch?v=Ip69mJyF-8s

0:00  Video overview
0:40  Introduction to complex numbers
13:46 Angle sum identity for sine and cosine
15:54 Heron's Formula

Pardon my pronunciation, I am not used to the spoken English very much.
Video download: http://www.olsak.net/mirek/manim/Complex-numbers-and-beautiful-derivations-of-ugly-formulas.mp4