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That's well said, jamesford. I tend to suggest that people memorize the formulas that are given in the booklet, especially the first three figures along with the pythag. theorem (6th figure). You will either waste a lot of time flipping back and forth, or (worse) you won't realize that the formula is even available in the first place. For example, you are given a 30-60-90 triangle along with its hypotenuse and you need to find the side across from the 60 deg. angle. First, you have to know that the 30-60-90 triangle is a given formula to get the question; it is even better to know it from memory.
Most of the remaining math you need to know is more factual (i.e., what an isosceles triangle is, slope-intercept line form, etc.) than formula-based.
I have to admit, I would never suggest that people memorize "2xy/(x+y)". This formula is very specific to one type of question that appears only occasionally. Even stronger students looking to save a little time would probably be better off knowing/learning the underlying concepts in that type of problem rather than that formula.
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