Entertaining, free, but equations are not editable

Entertaining, free, but equations are not editable

This application is exactly what it says it is: A Viewer.

You cannot edit the equations or create your own. If you want to do that, your Apple already has this program and it is called Grapher. Grapher is located in the Utilities folder of your Applications folder. Grapher also comes with many examples.

The other option looks to be the "lite" version of this application, also available here in the App Store.

lynxster about Graphing Calculator Viewer