(1) \((a+b)(a-b)=a^2-b^2\)
(2) \((a+b)^2=a^2+2ab+b^2\)
(3) \((a-b)^2=a^2-2ab+b^2\)
(4) \((a+b)(a^2-ab+b^2)=a^3+b^3\)
(5) \((a-b)(a^2+ab+b^2)=a^3-b^3\)
(6) \((a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca\)
(1) \((a+b)(a-b)=a^2-b^2\)
(2) \((a+b)^2=a^2+2ab+b^2\)
(3) \((a-b)^2=a^2-2ab+b^2\)
(4) \((a+b)(a^2-ab+b^2)=a^3+b^3\)
(5) \((a-b)(a^2+ab+b^2)=a^3-b^3\)
(6) \((a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca\)