Tangent of the Cross Curve
Also known as the Cruciform
x = a sec t
y = b csc t
The cross curve was first conceived by Terquem in 1847.
R.C. Yates, Curves and Their Properties, p. 203.
J. Dennis Lawrence, A Catalog of Special Plane Curves, pp. 130-131.
蔣聲, 形形色色的曲線, pp. 120-121.