Which mathematical product design innovation first introduced 3D graphing capabilities to handheld calculators, revolutionizing how students could visualize complex functions?

Product design in mathematics education has evolved significantly over centuries. From ancient abacuses to modern graphing calculators, the tools we use to learn and practice mathematics shape how we understand numerical concepts. This trivia question explores an innovative turning point in mathematical product design that revolutionized how students approach complex calculations and visualizations.

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TI-92 with Computer Algebra System (1995)
HP-28S with Advanced Graphics (1988)
Casio fx-7000G with Programmable Functions (1985)
Sharp EL-9300 with Multi-Line Display (1990)