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on 7 Oct 2021
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Compute and display a Hypotrochoid.
R1=.2; R2=.9; R3=.7;
a1=linspace(0, 9*pi*2, 500);
a2=a1*R1/R2;
X=(R1-R2)*cos(a1)-cos(a2)*R3;
Y=(R1-R2)*sin(a1)-sin(a2)*R3;
C=hypot(X,Y);
fill(X,Y,C);
axis('off','equal');
colormap(flipud(turbo))
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