Generally, math teachers look for the simplest ways to teach their pupils, while also making sure that they're interactive enough to keep them interested. Autograph is an advanced application that enables teachers and students to easily render 2D and 3D graphs.
Although it took longer than I expected to download and install the program, I must say it was worth the wait. The application might seem a bit overwhelming at first sight due to numerous buttons, but you can reduce their number by going to the View menu and displaying only the ones you need.
A good reason for trying this efficient tool is that it offers you the simplest way to create 2D and 3D graphs as your only task will be to simply enter the proper equations and values. Once you've finished building the graph, you can preview the plotting and save or print the project.
One aspect I wasn't too happy about when I saved the resulted graphs was that I could only save the projects as AGG files. Plus, the acquiring price for Autograph seems a bit too high. With that being said, it's up to you to decide whether it's worth buying this application.