Courbe de Watt

 

\textbf{Equation cartesienne:}

(x^2+y^2)^3-2d^2(x^2+y^2)^2\\+(d^4+4a^2y^2)(x^2+y^2)-4a^2b^2y^2\\\\\\\\d^2=a^2+b^2-c^2

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