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For any vector `vec a`, the value of `(vec a xx i)^(2) + (vec a xx j)^(2) + (vec a xx k)^(2) =`

A

`vec a^(2)`

B

`3 veca^(2)`

C

`4 vec a^(2)`

D

`2 vec a^(2)`

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The correct Answer is:
D
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