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Envelope of Two Families of Plane Curves
The equation of the envelope of the family of curves {, } is symmetric with respect to and . In this case the same curve is the envelope of the family of circles sliding along a figure-eight curve and the family of figure-eight curves sliding along a circle.




"Envelope of Two Families of Plane Curves" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/EnvelopeOfTwoFamiliesOfPlaneCurves/
Contributed by: Maxim Rytin
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