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Image: ubuntu2004
t = var("t") a=.5 b=1 tmini=0 tmaxi=10*pi
a,b,tmini,tmaxi
(0.500000000000000, 1, 0, 10*pi)
h1 = lambda t: [ (a+b)*cos(t)+b*cos(((b+a)/b)*t), (a+b)*sin(t)-b*sin(((b+a)/b)*t) ] q1 = parametric_plot(h1(t), tmini, tmaxi, rgbcolor=(1,0,0)) show(q1)