/* Une cardioïde
*/
import graph;

size(7cm,0);

real f(real t) {return 1+cos(t);}

path g=polargraph(f,0,2pi,operator ..)--cycle;
draw(g,lightblue+white);

xaxis("$x$");
yaxis("$y$");

draw((0,0)--(1,0),.8bp+blue,Arrow());
draw((0,0)--(0,1),.8bp+blue,Arrow());
dot("$(2,0)$",(2,0),N+E);