In mathematics, Poinsot's spirals are two spirals represented by the polar equations
where csch is the hyperbolic cosecant, and sech is the hyperbolic secant.[1] They are named after the French mathematician Louis Poinsot.
Examples of the two types of Poinsot's spirals
 The Poinsot spiral r=csch(θ/3). |  The Poinsot spiral r=sech(θ/3). |
See also
References
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