basic formulas
Posted by
Ravi Kumar at Monday, July 11, 2011
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>(a+b)²=a²+b²+2ab
>(ab)²=a²+b²2ab
>(a+b)²(ab)²=4ab
>(a+b)²+(ab)²=2(a²+b²)
>a²b²=(a+b)(ab)
>(a+b+c)²=a²+b²+c²+2(ab+b c+ca)
>a³+b³=(a+b)(a²+b²ab)
>a³b³=(ab)(a²+b²+ab)
>a³+b³+c³3a b c=(a+b+c)(a²+b²+c²abb cca)
>If a+b+c=0 then a³+b³+c³=3a b c