Recommendations for physics calculator?

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You can get a 30-day free trial of MathCAD through a vendor; if you're a student you can get the student version for $129 (which I think is fully functional).

Thanks. yes, I'm a student and $129 seems well worth it, that's less than the TI-89. Thanks for all the detailed comparisons. Even though I'm learning physics rather than engineering, MathCAD is probably my best starting point. I've actually seen references to it in a number of textbooks. Thanks again!