Yes, you can restrict the range. Here is an example that plots the square root of between 3 and 9:
if(x>3&x<9, sqrt(x),””)
Re: 2 functions—A possible trick (not recommended) is to make a second graph with the second function. Then give it a transparent background and place it on top of the first graph.
But eventually we’ll provide the ability to plot multiple functions in a graph with no tricks.