Which mathematical product design innovation was first to incorporate visual function graphing capabilities that revolutionized how students could interact with mathematical concepts?

The intersection of mathematics and product design has revolutionized how educational tools are developed. From basic calculators to advanced statistical software, mathematical product design has evolved significantly over decades. This poll tests your knowledge of key innovations in mathematics-focused products that transformed how we learn, teach, and apply mathematical concepts in everyday scenarios and professional environments.

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Texas Instruments TI-81 graphing calculator (1990)
Hewlett-Packard HP-35 scientific calculator (1972)
Mathematica software by Wolfram Research (1988)
Casio fx-7000G calculator (1985)