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For any three vectors `vec a, vec b, vec c` the expression `(vec a - vec b) . [(vec b - vec c ) xx (vec c - vec a)] =`

A

`[vec a vec b vec c]`

B

`2[vec a vec b vec c]`

C

`[vec a vec b vec c]^(2)`

D

none of these

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The correct Answer is:
D
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