Which of these graphing calculators, first launched in 1990, became the dominant brand in U.S. mathematics education with over 80% market share in schools by the mid-1990s?

In the 1990s, one product revolutionized mathematics education in classrooms across America. This device transformed how students visualized and solved complex equations, becoming a must-have tool for algebra, calculus, and beyond. Its iconic design and capabilities made it the market leader for decades, despite its premium price point. Can you identify this groundbreaking product launch that changed mathematics education forever?

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Texas Instruments TI-82
Casio fx-7000G
Texas Instruments TI-81
HP 48G