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I have a TI-92+ and a 49g+.
For long equations, the HP's will save you loads of time because of the RPN (reverse polish notation). For people that don't like RPN, TI it is.
If you've never used RPN before, you're in for a shock. But don't let it scare you, it's far superior.
Small example:
TI: 2 + 2 enter = 4
HP: 2 enter 2 + = 4
__________________
"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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