TI-89 Graphing Calculator For Dummies
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Of course your calculator needs a not-equal-to sign, but the TI-89 graphing calculator also offers the @, an exclamation mark, and a sigma. The following list shows you how to produce these symbols and more:

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C.C. Edwards is an instructor at Coastal Carolina University and a former editor of Texas Instruments' Eightysomething, a newsletter for parents and educators.

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