I wonder if anyone has a comprehensive system for memorizing mathematical formulae, operators, variables, what goes where, etc.

Simple formulae like πr² are easy enough to get into my brain, but what about more complicated formulae, like Q = mcΔt, where m, c, and Δt are all variables, PV = nRT (I get this one mixed up a bit), or even worse, m = (m₀ / sqrt(1 - (v²/c²))), pronounced “m = m sub zero over the square root of… 1 minus… v squared over c squared”.

Also, how do you handle Greek letters, like α vs. a, or λ vs. l, assuming your formula uses both? Sometimes I end up running into that type of situation where I need to keep track of both. (I think I remember a formula involving both l and λ but I forget what it was, sorry. I might also be misremembering.)