Thank you very much for your advice, acer

Thank you very much for your advice, acer

it will be good in maple 14 that in its help system or advanced programming guide includes how to improve the efficiency of a program or how to program efficiently. Because this problem is usually meet in the programming and it is difficult for many people.

thank you very much, Robert Israel

thank you for your reply,

by the way, how did you use the shortcut key Ctrl+P for the previous command?

it is always popup the printer interface when I use the Ctrl+P

would  you like to tell me which command in maple can show me the correct curves?

for this implicit function equation

plots[implicitplot](tan(2.1*x*sqrt(0.7e-1*y^2-1))-1.3*sqrt((1.5-0.6e-1*y^2)/(0.7e-1*y^2-1)), x = 0 .. 6, y = 0 .. 5, gridrefine = 6)

there are three unwanted curves in the figure.