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If a+b+c=0,\ (a+b)(b+c)(c+a) equals (a) ...

If `a+b+c=0,\ (a+b)(b+c)(c+a)` equals (a) `a b\ (a+b)` (b) `(a+b+c)^2` (c) `-a b c` (d) `a^2+b^2+c^2`

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