<p>I love my TI 89, but I have not ever used it for classes at cornell. The only times i have used a calculator (and just a plain old scientific one at that) are in science classes (physics and chem). Even my stats class, which in many cases requires a graphing calculator to do distribution stuff, no calculators were allowed (although previous semesters could use a calculator). </p>
<p>I would recommend taking all the AP credit you can get. Everything is harder at Cornell, even if you already know the material.</p>