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The biggest difference between the TI-83+ and the TI-89 is that the 89 will do the actual calculus. You can use the 83+ in calculus, but the 89 can actually figure out the derivatives and integrals.
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One day an Englishman, a Scotsman, and an Irishman walked into a pub together. They each bought a pint of Guinness. Just as they were about to enjoy their creamy beverage, three flies landed in each of their pints. The Englishman pushed his beer away in disgust. The Scotsman fished the fly out of his beer and continued drinking it, as if nothing had happened. The Irishman, too, picked the fly out of his drink but then held it out over the beer and yelled "SPIT IT OUT, SPIT IT OUT, YOU BASTARD!"
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