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Two dimensional curves
http://www.2dcurves.com/
Jan Wassenaar's collection of special plane curves, listed as algebraic (polynomials), transcendental (trochoids, cycloids, spirals, trigonometric, exponential) and derived (pedal, tractrix, barycentric, evolute, involute, inverse et al.); each entry has its own page with defining equations, noticeable properties, historical data.
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