Which TI graphing calculator model, launched in 1990, became so ubiquitous in mathematics education that it's still required in many classrooms today despite minimal design changes?

Texas Instruments revolutionized mathematics education with their graphing calculators, becoming essential tools in classrooms worldwide. Their journey from electronics company to educational technology leader represents one of the most successful product pivots in retail mathematics history. Test your knowledge about this iconic product line that transformed how students learn advanced mathematics!

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TI-83
TI-85
TI-89
TI-82