Which mathematical calculator brand launched the groundbreaking "Was Invented To Replace..." advertising campaign that highlighted how their product eliminated the need for complex logarithm tables?

Mathematics textbooks and educational tools represent a significant product sector with unique marketing challenges. Behind the formulas and equations lies a world of strategic branding, innovative design, and clever marketing campaigns. This trivia question explores how a famous mathematical product brand revolutionized its market through a distinctive advertising approach that connected with students and educators alike.

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Texas Instruments with their TI-84 series
Hewlett-Packard with their HP-35, the first scientific pocket calculator
Casio with their fx-CG50 graphing calculator
Sharp with their EL-5020 scientific calculator