Excerpt: TI's Motorola 68000-based TI-89 provides a built-in computer algebra system akin to computer software such as Mathematica and Maple. It can simplify mathematical expressions and perform partial fraction decomposition, useful for some intermediate calculus classes.
Excerpt: Statistically speaking, if you’ve held a graphing calculator, it was probably made by Texas Instruments. The TI-89 Titanium continues this legacy with more memory, more pre-installed applications, and more extra math goodies than previous iterations.
Pros: Most powerful TI model allowed on AP and SAT tests. Updated BASIC makes creating programs easy- if you have a rudimentary understanding of the language. Includes PDA functions like contacts and calendar. Customizable icon menu can tailor apps for each subject.
Cons: 300-page manual will be ignored by all but true geeks. May be too much calculator for casual users.