import graph;

unitsize(1cm);

path courbe=(.5,2){dir(-30)}..{0}(2.5,-2)..{dir(30)}(5,3);
draw(courbe,red);

// void xaxis(picture pic=currentpicture, Label L="", axis axis=YZero,
//            real xmin=-infinity, real xmax=infinity, pen p=currentpen,
//            ticks ticks=NoTicks, arrowbar arrow=None, bool above=false)
xaxis("$x$");

// void yaxis(picture pic=currentpicture, Label L="", axis axis=XZero,
//            real ymin=-infinity, real ymax=infinity, pen p=currentpen,
//            ticks ticks=NoTicks, arrowbar arrow=None, bool above=false)
yaxis();

shipout(bbox(2mm,Fill(white)));