1) (а^3+b^3)^2-2a^3b^3 =((a+b)(a^2-ab+b^2))^2-2a^3b^3= (a^2+2ab+b^2)*(a^4-a^2b^2+b^4) - 2a^3b^3=a^6+2a^3b^3+b^6-2a^3b^3=a^6+b^6
1) (а^3+b^3)^2-2a^3b^3 =((a+b)(a^2-ab+b^2))^2-2a^3b^3= (a^2+2ab+b^2)*(a^4-a^2b^2+b^4) - 2a^3b^3=a^6+2a^3b^3+b^6-2a^3b^3=a^6+b^6