Which customer demographic analysis technique revolutionized the development of advanced mathematics software interfaces between 2015-2020?

The mathematics software industry has grown significantly with digital transformation in education and research. Understanding customer demographics and usage patterns has become crucial for product development. This trivia question explores an interesting trend in customer feedback analysis for mathematics software products that emerged in the last decade.

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Eye-tracking heatmaps for equation navigation
Voice pattern recognition for formula dictation
Haptic feedback response measurement
Social media sentiment analysis of mathematics communities