In this section we will summarize the new Mathematica commands that you've
encountered in this lesson.
Plot is a Mathematica function for producing two-dimensional plots. It takes
as arguments the expression to plot, the name of the variable contained by the
expression, and the low and high bounds of the horizontal axis. Infinity and
negative infinity may be used as bounds.
Needs is used to read a package into Mathematica so that you can have access
to advanced Mathematica capabilities..