My science and math minded daughter used a loner TI-89 all through her senior year of High School and, after being accepted at a very good engineering collage, asked for one of her own as a graduation gift. My daughter could have asked for another model or brand, but she did research and was set on getting the TI-89. This was most useful for use in her AP Calculus and Physics classes so she checked and found that this would also be among the preferred model in her college classes.
This is a seriously complicated device with a large learning curve and is likely more calculator than most people will ever need, but for those that do need these functions this is likely the right choice. I have only used it a few times out of desperation and was able to navigate the basic functions.
Highly Recommended!
CFHGet more detail about Texas Instruments TI-89 Titanium Graphing Calculator.
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