Which of these mathematical product innovations was developed first and revolutionized how students could visualize and interact with complex equations?

The mathematics education market has seen numerous innovative products over the decades that have transformed how we learn and teach mathematical concepts. From basic calculators to advanced software, certain products have revolutionized accessibility and understanding of complex mathematical ideas. This poll tests your knowledge of breakthrough mathematical product innovations and the companies behind them.

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Texas Instruments' graphing calculator TI-81 (1990)
Wolfram Alpha computational knowledge engine (2009)
GeoGebra interactive mathematics software (2001)
Desmos online graphing calculator (2011)