(x-a(t))² + (y-b(t))² = r(t)², 0<=t<=pi[br]a(t) = cos(7t)[sup]9[/sup] cos(21t)[sup]10[/sup] cos(70t)[sup]8[/sup][br]b(t) = cos(2t)+cos(80t)[sup]2[/sup](cos(10t)cos(t))[sup]10[/sup]+(1/3) sin(420t)[sup]4[/sup]-(2/3)(sin(t)sin(5t))[sup]10[/sup][br]r(t) = 1/150+(1/30)sin(840t)[sup]2[/sup]+(1/3)sin(7t)[sup]8[/sup]