There was numerous problems involving very random equations (given in the solutions). For example, there was a question with 3 coordiantes and I was supose to find the area of the triangle - which was not any special triangle. the eq. they gave was :

A = 1/2[(x1y2 + x2y3 + x3y1) - (y1x2 + y2x3 + y3x1)]

I duno about you guys but I have never in my life come across this equation. Im guessing its some variation of herons formula and distance formula...

I mean I could use distance formula for each side and then plug it in to herons formula, but that would be VERY messy and time consuming. This is just an example of the kind of things that caught me off guard. There was alot of questions that sported unorthodox equations in their solutions (eqs that wernt covered in kaplan and are even hard to come by on the net)

I guess im rambling... what im trying to get at is this. For those of you who took the test, how many times did you come across a question that required you to know some kind of special formula to solve in any reasonable amount of time?

Also, if you guys could add some equations that you found useful I would really appreciate it.

Thank you~