Simplest algebra

Algebra Level 2

(ab)3+(bc)3+(ca)3(ab)(bc)(ca) \frac{ (a-b)^3+(b-c)^3+(c-a)^3} {(a-b)(b-c)(c-a) }

What is the value of the expression above if ab,bc,aca \ne b, b \ne c, a \ne c .

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