The command in Maple is plot. The syntax is
> plot(f(x),x=a..b,y=c..d);
where 
is a function or an expression. You can leave out the
specification of the range, but the domain must be specified. To plot
several functions at a time, the syntax is
> plot({f(x),g(x),h(x),...},x=a..b,y=c..d);
Where f, g, and h are functions and ``...'' means you can plot
more than three functions at a time.
You can also plot expressions you have defined, or simply use
expressions as arguments to the plot command. For example, you
could plot the expression p defined earlier and the expression
on the same plot with the command
> plot(p,x^2,x=1..5);
You can also plot parametric curves of the form 
with the
Maple plot command. The example given below plots the unit
circle.
> plot([cos(t),sin(t),t=-Pi..Pi]);