Which competing product did Texas Instruments acquire in 1990, eliminating a major rival to its graphing calculator business before launching the first TI-82 calculator?

Texas Instruments has dominated the graphing calculator market for decades, particularly in educational settings. Their iconic TI-84 series has become a staple in mathematics classrooms worldwide despite technological advances in computing. This poll tests your knowledge about this enduring product's corporate history and its remarkable market position in the mathematics education industry.

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Casio's GraphMaster division
HP's educational calculator patents
The Derive computer algebra system from Soft Warehouse
Sharp's EL-9600 graphing calculator technology