Which calculator brand became ubiquitous in mathematics classrooms worldwide due to its 'Teachers Preferred' marketing campaign in the 1990s?

In the world of mathematics education, calculators transformed how students learn and engage with numbers. The marketing and branding strategies behind these devices helped shape generations of mathematicians and engineers. This trivia question explores how one particular brand dominated classrooms through clever marketing and brand positioning, becoming synonymous with mathematics education itself.

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Texas Instruments (TI)
Casio
Hewlett-Packard (HP)
Sharp