Factorise 8(a+b+c)^3-(b+c)^3-(c + a)^3-(a+b)^3
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(a-b)³+(b-c)³+(c-a)³
=(a³-3a²b+3ab²+b³)+(b³-3a²b+3ab²-c³)+(c³-3a²b+3ab²-a³)
= -3a²b+3ab²-3b²c+3bc²-3c²a+3ac²
= 3a²(c-b)+3b²(a-c)+3c²(b-a)
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