I want to graph x=f(t) and y=g(t) but I want some sampling of values of t on the graph. Is there an option of plot command or a specialized program for doing this? So for example say x=cos(t), y=sin(t). I want to annotate the graph by putting t=0, t=pi/6, t=pi/4, etc on the graph. Of course this can be done by adding many text boxes to the graph but I was looking for a more automated solution.