MathStep is a symbolic pocket calculator with a complete CAS (Computer Algebra System) built-in. That means that it can solve math problems for you! It has an expression editor with a live preview and even gives you hints to solving a problem by yourself for some operations. It can even work without an internet connection!The following operations are currently supported:- Simplification- Deriving- Integration- Calculating limits- Calculating sums- Determining series expansions- Solving equations