Complete square formula: (a+b)? =a？ +2ab+b？
Cubic sum formula: (a+b)(a? -ab+b？ )=a^3+b^3
Cubic difference formula: (a-b)(a? +ab+b？ )=a^3-b^3
Complete cubic formula: (a+b) 3 = a 3+3a? b+3ab？ +b^3
The complete square formula of three numbers: (a+b+c)? =a？ +b？ +c？ +2ab+2bc+2ca