The swastika curve is Cundy and Rollett's (1989, p. 71) name for the quartic plane curve with Cartesian equation
and polar equation
The swastika curve is Cundy and Rollett's (1989, p. 71) name for the quartic plane curve with Cartesian equation
and polar equation
Weisstein, Eric W. "Swastika Curve." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SwastikaCurve.html