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Change the parametrization constant:
33
a=
Track the black dot:
66
t=
Change the radius:
0.12
r=

The curve c(t)=(rcos(at),rsin(at))
-1.5-1-0.50.511.5-1.5-1-0.50.511.5
x

The circle can be given as x2+y2=1