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a (a - b) + b (b - c) + c (c - a) =...

a (a - b) + b (b - c) + c (c - a) = __

A

0

B

`a^2` - `b^2`

C

`a^2` + `b^2`

D

`a^2` + `b^2` + `c^2` - ab - bc - ca

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