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Epicycloid - Wikipedia
Epicycloid -- from Wolfram MathWorld
Epicycloid - Desmos
Deriving the Equations of an Epicycloid - YouTube
Epicycloid - Encyclopedia of Mathematics
EPICYCLOID - MATHCURVE.COM
Epicycloids | Teaching Calculus
Epicycloid - Michigan State University
Cycloidal curve - Encyclopedia of Mathematics
Epicycloid - MacTutor History of Mathematics