Which of these mathematical product launches was described as 'democratizing mathematics' and led to a significant shift in high school and university teaching methodologies in the 1980s?

Throughout history, the launch of groundbreaking mathematical tools and products has transformed how we teach, learn, and apply mathematics. From calculating devices to educational software, these product launches represent pivotal moments in mathematical history. This trivia question explores one such revolutionary product launch that changed how mathematics is taught and visualized in classrooms worldwide.

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Texas Instruments TI-81 graphing calculator
Mathematica software by Wolfram Research
The first edition of 'Mathematical Methods' textbook series
HP-35 scientific pocket calculator