Which calculator brand was the first to introduce graphing calculators to the mass educational market in 1985, fundamentally changing how mathematics was taught in schools?

Mathematics education has been shaped by various publishing companies and calculator brands throughout history. These companies have not only provided tools and resources but have also influenced how mathematics is taught and learned. This trivia question explores the fascinating history of a pioneering brand that revolutionized mathematical calculations in classrooms worldwide.

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Texas Instruments with the TI-81
Casio with the fx-7000G
Hewlett-Packard with the HP-28C
Sharp with the EL-5200