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http://blog.jr.com/the-ti-89-is-the-math-students-best-friend/
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blog.jr.com: The TI-89 is the Math Student’s Best Friend

Ian · 1 year ago

The TI-89 is an excellent calculator. My pre-calc - calc 3 teachers banned us from using them in class because they can do differentian and anidifferentian for you. Excellent tool for Math, Science& engineering majors.