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.

• Enhanced classroom power:
  Math and science students will benefit from algebraic entry-system logic and easy-to-use interactive tools.
  Perform complex arithmetic and calculus functions with Computer Algebra System (CAS)
  Improve problem solving and learning opportunities with symbolic, numeric and graphic views
  Easily create and use Aplets to assist in learning
  Review and work with your data using interactive history, notes and sketch capabilities Complex problem solver Complex problem solving is easier on a large, dynamic split screen with adjustable contrast and 2.25MB of total memory.
  Easy readability on dynamic split screen with adjustable contrast
  Get outstanding performance and ample storage with 2.25MB of total memory (2MB Flash + 256KB RAM)
  Tackle tough problems with over 750 built-in functions plus powerful HP solvers and applications
  Use a built-in library of 29 constants and easy metric unit conversions for math and science
  
  
• Designed to be efficient
  Access online applications and share data through a variety of connectivity options. Improve accuracy with HP click-style keys.
  Download and share data with PCs and other devices using USB and serial ports
  Reduce keying errors and improve accuracy with unique HP click-and-rotate keys
  Increase protection and improve portability using slide-on hard cover
  Get added flexibility using on-screen dynamic menu options
  
  
• HP quality and support
  Have confidence that every time you turn on your HP calculator, every calculation you make, results in dependable, worry-free performance and accurate results.
  Rely on HP quality and award-wining support online and by phone
  
  
• The HP 40gs Graphing Calculator includes all the features of the HP 9G plus:
  Computer Algebra System (CAS)
  Symbolic, numeric and graphic views
  Linear equation solver and triangle solver
  2.25MB total memory (2MB Flash ROM + 256KB RAM)
  Enhanced connectivity with serial port, USB
  Adjustable contrast for greater readability
  Built-in constant library
  Slide-on hard cover included