Thank Thomas and Alec for the help. How to only lable x axis at [-2,-1,1,2] and y axis at [-10,-5, 5, 10] in the plot? I wonder where and how to reference the examples, apart from ?plot? plot([f1,f2,f3], x=-2..2, y=-10..10,TITLE(PLOT: y=100+sin(x+1)^3 ));

Thank Alec for the nice help. Under your help, I finally write out my first MAPLE procedure. Thank Douglas for the much neater and artful code, either.