a 3 (b-c)+b 3 (c-a)+c 3 (a-b)
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a 3 (b-c)+b 3 (c-a)+c 3 (a-b)
=a 3 b-a 3 c+b 3 c-b 3 a+c 3 a-c 3 b
=a 3 b-b 3 a-(a 3 c-b 3 c)+c 3 (a-b)
=ab(a 2 -b 2 )-c(a 3 -b 3 )+c 3 (a-b)
=ab(a+b)(a-b)-c(a-b)(a 2 +ab+b 2 )+c 3 (a-b)
=(a-b)[ab(a+b)-c(a 2 +ab+b 2 )+c 3 ]
=(a-b)[b 2 (a-c)-c(a 2 -c 2 )+ab(a-c)]
=(a-b)(a-c)[b 2 -c(a+c)+ab]
=(a-b)(a-c)[(b 2 -c 2 )+a(b-c)]
=(a+b+c)(a-b)(b-c)(c-a).
=a 3 b-a 3 c+b 3 c-b 3 a+c 3 a-c 3 b
=a 3 b-b 3 a-(a 3 c-b 3 c)+c 3 (a-b)
=ab(a 2 -b 2 )-c(a 3 -b 3 )+c 3 (a-b)
=ab(a+b)(a-b)-c(a-b)(a 2 +ab+b 2 )+c 3 (a-b)
=(a-b)[ab(a+b)-c(a 2 +ab+b 2 )+c 3 ]
=(a-b)[b 2 (a-c)-c(a 2 -c 2 )+ab(a-c)]
=(a-b)(a-c)[b 2 -c(a+c)+ab]
=(a-b)(a-c)[(b 2 -c 2 )+a(b-c)]
=(a+b+c)(a-b)(b-c)(c-a).
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