This app will provide you a great tool if you want to plot a mathematic function.
You only have to write formula, and curve will be displayed in a customizable chart.
You can choose minimal and maximal abscissa (by default it is set from -5 to 5).
It is possible to display derivative function, so you can see both f(x) and f'(x) curves.
If you click on "VALUES" button, il shows all values between selected bounds.
It can replace your scientific calculator !