There are three conical sections:
ellipse with eccentricity e:0≤e≤1e:0\le e\le 1e:0≤e≤1
parabola with eccentricity e:e=1e:e=1e:e=1
hyperbola with eccentricitye:e=1e:e=1e:e=1
Grarh r=θr=\thetar=θ in polar coordinates
r=θr=\thetar=θ forms a spiral
r=θr=\thetar=θ is not a conical section.
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