Do trigger expressions using last() work like math functions

[StefanK]

I would like to know if i can do this for example:

(last(key[],#1) and last(key[],#2) and last(key[],#3)) = "x"

or do i have to do:

last(key[],#1) = "x" and last(key[],#2) = "x" and last(key[],#3) = "x"

[kyus]

This one will work:

(last(key[],#1) and last(key[],#2) and last(key[],#3)) = "x"

Just keep in mind that last(key[],#1) is the latest value, last(key[],#2) is the second latest value and so on...
If that's what you need, then yes, it'll work.