Tangent of Bowditch Curve

x = cos 3t

y = sin 4t

Reference

• Robert C. Yates, A Handbook on Curves and Their Properties, p. 203.

• J. Dennis Lawrence. A catalog of special plane curves, pp. 178-179.

• 2d Curves : http://www.2dcurves.com/trig/trigl.html

• Jen-Chung Chuan : http://steiner.math.nthu.edu.tw/ne01/tjy/dynamic/contants/FamousCurves-e.html