A list of plotting commands. [some require with(plots)]
	plot, plot -- parametric form, plot3d, implicitplot3d, contourplot,
	spacecurve, gradplot, fieldplot, plot3d -- surface form,
	display -- used to combine plots.

A list of plotting options
	axis, title, numpoints, scaling, style, contours, arrows, color,
	orientation, thickness 

Handy commands
	evalf, eval, solve, diff, int, sqrt, mtaylor

vector commands [some require with(linalg)]
	vector, dotprod, grad

Quirks:
1. Maple crashes, save early and often.
2. Typos, typos, typos. The syntax is unforgiving.
	A. Need a star between (x-1)(x-2) or between 2x or between x y.
	B. Need a `;' or `:' to end a statement.
	C. Need f:=x^2-3 for assignment, f=x^2-3 is an equation.
	D. f(x):=x^2-3 is always wrong.
	E. Pi is 3.14159... but pi is just a greek variable.
	F. E and e are just variables, exp(1) is 2.7182818...
	G. Write e^x as exp(x) and not exp^(x).
	H. X and x are different variables.
	I. Doing x:=7; is a mistake, you need to do x:='x'; or restart to
		make things work correctly again.
	J. 1/2*x is x/2 and not 1/(2*x).
3. If you forget with(plots) or misspell a command, Maple echoes the
command like it understood but is refusing to act. Maple thinks you
are infinity smart, and doesn't give great error messages.
4. Ugh, it is a programming language and you have to debug. And the
hardest thing to debug is when you get an answer but it is wrong.
5. The order of execution can get out of synch with the order of 
presentation.