Tangent of Kampyle of Eudoxus

r = sec ² t

References:

J. Dennis Lawrence, A Catalog of Special Plane Curves, pp. 141-143.
R.C. Yates, Curves and Their Properties, p. 204.
http://www.math.hmc.edu/~gu/math142/mellon/curves_and_surfaces/curves/kampyle.html