Notice that can be written as
Do you recognize (in general) in it? ...
EDIT: I changed the variables, because otherwise it can be confusing.
I recognized it now thanks to the way you laid it out. However I did not see that before because I was trying to factorize the expression by grouping the terms in pairs so that each pair of terms has a common factor.
My question is, if I did not recognize what you pointed out, how do I factorize this expression by grouping?
For example (assuming my working is correct)