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. You have a trace function that let you move a current point on curve, while its cord