Which graphing calculator brand became so dominant in mathematics education that its product name became generically used for all graphing calculators, achieving over 80% market share in US schools during the 1990s?

In the world of mathematics education, certain products have transformed how students learn and engage with complex concepts. Graphing calculators represented a pivotal innovation that merged technology with mathematical instruction, creating an entirely new product category. These devices fundamentally changed classroom dynamics and created fierce brand loyalty among mathematics educators and students. This poll tests your knowledge about a significant product marketing milestone in the mathematics education industry.

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Texas Instruments (TI)
Hewlett-Packard (HP)
Casio
Sharp