The TI-89 graphing calculator has all kinds of special functions. It can, of course, give you the mathematically certain answer you need, but it can also offer an approximation. You can tell it to stop calculating if need be, and you can go back to a previous graph. The following short list shows you how to do each:
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Source:http://www.dummies.com/how-to/content/accessing-odd-functions-on-the-ti89-graphing-calcu.html
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