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Heh... graphing calculators are way more powerful than most teachers realize. In my high school calculus class, we created a handful of programs to do things like solve the quadratic equation for us, just to save time. The teacher wasn't a complete idiot; before every test he would go to each desk and personally clear the memory of each calculator.
What he didn't realize was that you could reassign even the basic programs that came with the calculator. You could, in fact, write a program which simply displayed "Memory Cleared" on the screen when the appropriate menu item was selected, only without the actual deleting of anything.
Then again, maybe he did know that, and just figured that if we were smart enough to program such a thing, we didn't really need to worry about his class anyway.
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