The Casio FX-991EX is a highly advanced scientific calculator designed for students, engineers, and professionals who require extensive mathematical and scientific functions. It features a high-resolution display, allowing users to view complex mathematical expressions and results clearly. The FX-991EX includes a wide range of functions such as trigonometry, calculus, statistics, and complex number calculations. It also supports equation solving, matrix calculations, and spreadsheet-like functionality. With its comprehensive features and user-friendly interface, the Casio FX-991EX is widely regarded as one of the top choices for scientific calculators in various educational and professional settings.