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TANGENTOID

Cartesian equation: .
Transcendental curve. 
The tangentoid is the plot of the tangent function.
If the plane of the tangentoid is winded into a cylinder
of revolution with directrix Oy and radius b/2, then we get
a horopter curve.
See also the hyperbolic
tangentoid and the pseudoelliptic
radioid.
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© Robert FERRÉOL 2017