by 
MiMI
ANSWERS: 1
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How generic do you want them? Here are some: Ellipse: r^2 = a^2 b^2 / (a^2 sin^2 t + b^2 cos^2 t) r = s (1 - ecc^2)/(1 - ecc cos t) Parabola: r = 2a / (1 - cos t) Hyperbola r^2 = a^2 b^2 / (b^2 cos^2 t - a^2 sin^2 t) r = s(ecc^2 - 1) / (1 - ecc cos t)
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