Equation in the polar coordinate system:

$\rho =cos\frac{a}{b}\theta +\frac{c}{d}$

$\rho =cos\frac{a}{b}\theta +\frac{c}{d}$

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The equations were taken from the special issue #8 of the Revue du Palais de la Découverte (“Courbes mathématiques” – prepared by Jean Brette – July 1976 – ISBN: 2‑85607‑003‑5 – ISSN: 0180-3344).

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