Which groundbreaking feature did Texas Instruments first introduce in their TI-92 calculator in 1995 that revolutionized math education product development?

Graphing calculators revolutionized mathematics education by making complex visualizations accessible to students. These sophisticated tools required innovative product development approaches to balance computational power, usability, and educational value. This poll tests your knowledge about a pivotal moment in the history of mathematical educational technology that transformed how students learn advanced mathematics concepts.

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Computer Algebra System (CAS) with symbolic manipulation capabilities
Touchscreen interface with handwriting recognition for equations
Cloud connectivity for sharing calculations between devices
Voice recognition for hands-free equation solving