Poinsot's spirals are the two polar curves with equations
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(1)
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(2)
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Poinsot's Spirals
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References
Lawrence, J. D. A Catalog of Special Plane Curves. New York: Dover, pp. 192 and 194, 1972.Cite this as:
Weisstein, Eric W. "Poinsot's Spirals." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/PoinsotsSpirals.html