https://www.mapleprimes.com/questions/221777-Error-In-The-Calculation-Of-The-Arc
Error in the calculation of the arc length of a hypotrochoid - MaplePrimes
in thearc lengtherrorcalculationhypotrochoid
https://makezine.com/article/technology/robotics/hypotrochoid-drawing-robot/
Hypotrochoid-drawing robot - Make:
Jul 23, 2010 - Agnewgraph I is a device that traces Spirograph curves (technically, hypotrochoids). Unlike other systems that compute and plot hypotrochoids
drawing robothypotrochoidmake