The HP 40GS Graphing Calculator has been specifically designed with both students and teachers in mind. As your calculations become more and more intricate, the HP 40GS makes solving them easy with a built-in Computer Algebra System (CAS). CAS delivers dynamic symbolic manipulation and numeric solving so you can easily perform complex arithmetric or calculus functions. Easy programming to create custom aplets using formulas and equations, to assist with learning Interactive history, notes and sketch capabilities to review and interact with data.