DiffIt! free calculates and explains derivatives of mathematical functions.Type in a mathematical function and DiffIt! Free will differentiate it. What's more it can even tell you how it arrived at the result. The explanation traces all the steps and also tells you which rules have been applied. This easy to use tool can help you learn how to find derivatives of most common functions.Functions supported are:sqrt expsin cos tanasin acos atan sec cosec cotsinh cosh tanh asinh acosh atanh sech csch cothln log log2erf erfcDiffIt! Free is ad supported. If you like this app and you want to get rid of the advertising, please support us and purchase the full version called DiffIt!Known issues:- Function arguments must be enclosed in brackets, e.g. "sin(x)"Inputting "sin x" will result in the whole expression being interpreted as a constant- Missing help- Welcome dialog displays every time device is turned- Expression simplification can be improved