Poinsot's spirals - Alchetron, The Free Social Encyclopedia

In mathematics, Poinsot's spirals are two spirals represented by the polar equations

r = a csch ⁡ ( n θ ) r = a sech ⁡ ( n θ )

where csch is the hyperbolic cosecant, and sech is the hyperbolic secant. They are named after the French mathematician Louis Poinsot.

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