This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Rotations on the complex plane.svg Four numbers on the real line are multiplied by integer powers of the imaginary unit which corresponds to rotations by multiples of the right angle Selfmade Written in TeX with TikZ compiled using latex rot tex dvisvgm rot dvi documentclass article usepackage amsmath usepackage amsfonts usepackage