Which groundbreaking mathematical product, launched in 1975, featured transparent plastic layers that could be manipulated to demonstrate 3D calculus concepts and became standard in university classrooms?

Before digital tools transformed mathematics education, one particular product revolutionized how calculus was taught in universities worldwide during the 1970s and 1980s. This innovation made complex visualizations accessible to students without requiring massive computational resources, creating a paradigm shift in mathematics education. Test your knowledge of this influential product that changed how generations of students learned advanced mathematics!

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• The Hewlett-Packard HP-35 Scientific Calculator
• The 'Calculus Visualizer' 3D Modeling Kit by Texas Instruments
• The 'Transforma-Graph' Layered Function Analyzer
• The MIT-developed 'MathVision' Projection System

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