Which graphing calculator brand first introduced Computer Algebra System (CAS) capabilities in a handheld device, allowing for symbolic mathematics rather than just numerical calculations?

In the world of mathematics education and professional computation, graphing calculators transformed how we visualize and solve complex problems. One brand in particular dominated classrooms and exams for decades with innovative product development and strategic educational marketing. This poll tests your knowledge about the history of these influential mathematical tools that changed how students learn advanced mathematics.

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Texas Instruments with the TI-92 in 1995
Casio with the CFX-9850G in 1996
HP with the HP-48G in 1993
Sharp with the EL-9600 in 1997