Here is what I've been compiling as the hardest to learn formulas for the memorization phase. Not surprisingly Derivatives accounts for over 50% of the formulas, but after 3 days of writing them out between class homework I think I finally have FRA's, Swaps, and continuous or discrete forwards/futures correct and mechanical. There are some very long formulas that I haven't included in this list (like the high low DDM model), there are also nearly 150 'extremely' important formulas to know (aggregate accruals, FCFF, ect) not included only because they are easy and usually quickly derivable. So here is the abridged list of the hardest of the hard, but still worth knowing. (Click to enlarge).
Shorthand, top to bottom:
D=Dividend Yield
Rxnew=The Xdate yield that is now known at time t
+...+ = repeat first operation for all time periods until last (k) time period
RM=Market Risk Premium, not to be confused with Rm which is market return. This is a academic notation standard that is very important to catch before you start writing corporate finance exams.
rce= Cost of common equity
inf = inflation
FLT = flowthrough of inflation
rr= retention rate (in my opinion much more descriptive than "b" which all the text books use)
