[질문] 고1곱셈공식의변형,최대한많이ㅜㅜ(짤려도ㅇ)

a²+b²=(a+b)²-2ab=(a-b)²+2ab=(1/2){(a+b)²+(a-b)²}a³+b³=(a+b)³-3ab(a+b)a³-b³=(a-b)³+3ab(a-b)x²+1/x²=(x+1/x)²-2=(x-1/x)²+2x³+1/x³=(x+1/x)³-3(x+1/x