Which innovative retail strategy did Texas Instruments use in the 1990s that helped the TI-83 graphing calculator become the dominant brand in mathematics classrooms for decades?

The world of mathematics education was forever changed with the introduction of advanced graphing calculators. These devices transformed how students learn complex mathematical concepts, from algebra to calculus. But how well do you know the marketing history behind these revolutionary educational tools that have become standard equipment in mathematics classrooms worldwide?

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They created an educator network that provided free training and materials to mathematics teachers, building brand loyalty in educational institutions
They partnered with famous mathematicians like Andrew Wiles to endorse their calculators after he proved Fermat's Last Theorem
They implemented an annual trade-in program allowing students to upgrade their calculators at 50% discount, creating sustained customer loyalty
They developed the first AI-powered help system that could recognize common mathematical errors and suggest corrections