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FORMULE
(a+b)²=a²+2ab+b²
(a-b)²=a²-2ab+b²
(a+b)(a-b)=a²-b²
a³+b³=(a²+b²)(a²-ab+b²)
a³-b³=(a-b)(a²+ab+b²)
(a+b)³=a³+3a²b+3ab²+b³
(a-b)³=a³-3a²b+3ab²-b³
(a+b+c)²=a²+b²+c²+2ab+2bc+2ac
(a+b+c)³=a³+b³+c³+3(a+b)(b+c)(c+a)
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