Which mathematical product development milestone in the 1970s revolutionized algebra education and is credited with creating the first handheld 'computer algebra system'?

In the world of educational mathematics products, certain innovations have revolutionized how students learn and engage with complex concepts. This poll tests your knowledge about a significant product development milestone in the mathematics education industry that changed how mathematical problems are approached and solved.

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HP-35 scientific calculator with trigonometric functions
TI-59 programmable calculator with symbolic algebra capabilities
Casio fx-7000G, the first graphing calculator
The Mathematica software package by Wolfram Research