input courbescp13;

beginfig(1);
  depart((0,0),(8,8),(4,4),4,4);
  draw grille(0.5);
  draw axes;
  graduantx.bot;
  graduanty.llft;
  draw param1(0,2*pi,100,((cos(t))**3,(sin(t))**3)) withcolor bleu;
  draw tangenteparam1(3*pi/4,0,2*pi);
endfig;
end