Help With Math: Purveyors of MathXpert
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MathXpert comes in three versions: Algebra Assistant, Precalculus Assistant, and Calculus Assistant.
It runs on any version of Windows. You can run it on a Mac using Virtual PC or on Linux using WINE.
You can download any of the three Assistants, either in a free 14-day trial version, or the full version.
The trial version has all the capabilities of the full version, except that it will expire after 14 days, and each time at startup will ask if you want to purchase or continue the evaluation.