<p>do I need to know the half angles and difference formulas and all that crap?</p>
<p>yep you do</p>
<p>It depends. There may be one, but generally only one, question where those formulas would be useful. Certainly learn the other trig identities ("basic" and pythagorean's), but the more complicated ones will probably end up being superfluous. With the curve you can count on missing one question and still be well in the 800 range.</p>
<p>get a ti-89 and you don't need to study.. u can get around 6 wrong for an 800</p>