satorovamavzun a^2+2ab+b^2/2a^4-2b^4=
= (a+b)^2/2(a^4-b^4)=
= (a+b)^2/2(a^2-b^2)(a^2+b^2)=
=(a+b)^2/2(a-b)(a+b)(a^2+b^2)=
=a+b/2(a-b)(a^2+b^2)