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Just a few random, useful things, e.g.,
 
iff : "if and only if," ⇔.
wrt : "with respect to."
 
i2 = - 1
|x + yi| = √(x2+y2) (note, |z1 z2| = |z1| |z2|)
ei x = cos x + i sin x
sinh x = 1/2 (ex - e-x) = - i sin ix
cosh x = 1/2 (ex + e-x) = cos ix
tanh x = sinh x / cosh x
 
cos2 x + sin2 x = 1
cosh2 x - sinh2 x = 1
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