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Cayley's sextic

Cayley's sextic
A sinusoidal spiral curve described by the Cartesian equation

4(x2 + y2 - ax)3 = 27a2(x2 + y2)2

It was discovered by Colin Maclaurin but was first studied in detail by Arthur Cayley and named after him by R. C. Archibald in 1900.

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