Which of these mathematics education products was a major retail failure that cost its company over $100 million in the 1990s due to being too advanced for its time?

The retail world of mathematics education products has evolved dramatically over the decades. From basic calculators to advanced learning systems, companies have developed innovative ways to make math more accessible and engaging. This trivia question explores a significant retail failure in the mathematics education market that serves as a cautionary tale about product-market fit and timing.

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Texas Instruments' Neural Math Solver (a handheld device that could solve equations by recognizing handwritten math problems)
Casio's MathVision (augmented reality glasses that displayed step-by-step solutions to problems in textbooks)
IBM's MathPartner (an early AI-based tutorial system requiring dial-up internet connection)
HP's GraphMaster (a 3D holographic graphing calculator that projected models into physical space)