Calculating Self-intersecting points in Fourier polynomial curves (Polyline approximation)

In the Lamberto Lamberti "Curve polinomi di Fourier" [url=https://www.geogebra.org/m/ys7yqzzu]applet[/url], I added the calculation of Self-intersection points in the Fourier polynomial curves.
– Roman Chijner

Information: Calculating Self-intersecting points in Fourier polynomial curves (Polyline approximation)