[질문] 곱셉공식의변형좀알려주세요

a제곱 + b제곱 = (a+b)제곱-2ab, a제곱 + b제곱 = (a-b)제곱+2ab ,(a+b)제곱 = (a-b)제곱 +4ab ,(a-b)제곱 = (a-b)제곱 -4ab 입니다^^좋은하루되세요~