Which graphing calculator feature, first introduced by Texas Instruments in 1990, revolutionized the consumer experience and became a standard expectation in the mathematics education market?

Graphing calculators revolutionized how students learn advanced mathematics, creating a unique consumer journey in educational technology. Once specialized tools for professionals, they've become standard equipment for millions of students worldwide. This trivia question explores a fascinating aspect of this mathematical consumer product journey and its impact on the educational landscape.

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• The ability to graph multiple functions simultaneously in different colors
• Built-in computer algebra system (CAS) for symbolic mathematics
• Flash memory that allowed calculator operating systems to be upgraded
• Wireless connectivity for classroom participation systems

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