a³+b³+c³ + a²(b+c) + b²(c+a) + c²(a+b) by (a²+ b² + c²)
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a³+b³+c³ + a²(b+c) + b²(c+a) + c²(a+b)
=a³+ a²(b+c)+b³+b²(c+a)+c³ + c²(a+b)
=a²(a+b+c)+b²(a+b+c)+c²(a+b+c)
=(a+b+c)(a²+b²+c²)/(a²+b²+c²)
=(a+b+c)
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