4) (2m+n)(-m-3n)-(4n-2m)(m+n) =
= -2m^2-6mn-mn-3n^2-(4mn+4n^2-2m^2-2mn) =
= -2m^2-6mn-mn-3n^2-4mn-4n^2+2m^2+2mn =
= -9mn+n^2
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4) (2m+n)(-m-3n)-(4n-2m)(m+n) =
= -2m^2-6mn-mn-3n^2-(4mn+4n^2-2m^2-2mn) =
= -2m^2-6mn-mn-3n^2-4mn-4n^2+2m^2+2mn =
= -9mn+n^2