Which company's graphing calculator product launch in the early 1990s transformed mathematics education and became the dominant brand in classrooms for decades?

In the 1990s, a revolutionary product changed how mathematics was taught in classrooms across America and eventually worldwide. This powerful handheld device transformed how students approached complex math problems, visualized functions, and engaged with mathematical concepts. Its launch represented a paradigm shift in mathematics education that continues to influence teaching methods today.

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Texas Instruments with the TI-83
Hewlett-Packard with the HP-48
Casio with the fx-7000G
Sharp with the EL-9600