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If vec a and vec b are two unit vectors,...

If `vec a` and `vec b` are two unit vectors, then the vector `(vec a + vec b) xx (vec a xx vec b)` is parallel to the vector

A

`vec a + vec b`

B

`vec a - vec b`

C

`2 vec a + vec b`

D

`2 vec a - vec b`

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The correct Answer is:
B
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