#2 Label graphs with key.

[Nikolas Britton]

It would be a good idea if the functions that were graphed were labeled... If you save the graph as a image you won't know whats what and you can also have multi graph windows open at the same time.

So for example:
Fn 1 = sin(x)
Fn 2 = cos(x)
Fn 3 = tan(x)

Then in the graph window make a key, which would be displayed in one of the corners of the window, that displays each function in the correct color:

Key:
sin(x) is shown in red.
cos(x) is shown in purple.
tan(x) is shown in green.