Which calculator brand pioneered the use of Computer Algebra Systems (CAS) in handheld calculators for education, fundamentally changing how students could interact with symbolic mathematics?

Throughout history, the tools mathematicians use have evolved dramatically - from ancient counting boards to modern graphing calculators. But product design in mathematics isn't just about functionality; it's about creating tools that make complex concepts accessible and intuitive. This poll tests your knowledge about a revolutionary product design that changed how students approach mathematical concepts.

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• Texas Instruments with their TI-92 calculator (1995)
• Casio with their fx-7000G calculator (1985)
• Hewlett-Packard with their HP-28 calculator (1987)
• Sharp with their EL-9900 calculator (1997)

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