1.(a-b)^2*(a^2+ab+b^2)^2 =((a-b)(a^2+ab+b^2))^2=(a^3-b^3)^2=a^6-2a^3b^3+b^62..(a+b)^2*(a^2-ab+b^2)^2=(a^3+b^3)^2=a^6+2a^3b^3+b^6