Build/source/utils/asymptote/examples/cos2theta.asy


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import graph;
size(0,100);

real f(real t) {return cos(2*t);}

path g=polargraph(f,0,2pi,operator ..)--cycle;
fill(g,green+white);
xaxis("$x$",above=true);
yaxis("$y$",above=true);
draw(g);

dot(Label,(1,0),NE);
dot(Label,(0,1),NE);