r=1-sin(theta)
(x^2+y^2-1)^3-x^2y^3
x=sin(t)cos(t)log(|t|), y=|t|^0.3sqrt(cos(t))
x^2+(y-(2(x^2+|x|-6))/(3(x^2+|x|+2)))^2-36をプロット,x=-0.2..0.2, y=-2.3..-1.7
r(t)=2-2sin(t)+sin(t)|cos(t)|^0.5/(sin(t)+1.4)を極プロット
x=16sin(t)^3, y=13cos(t)-5cos(2t)-2cos(3t)-cos(4t)
x^2+(y-(x^2)^(1/3))^2-1をプロット,x=-1.4..1.4, y=-2..2
x=-2^0.5(sin(t))^3, y=2cos(t)-(cos(t))^2-(cos(t))^3