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If vec(a) and vec(b) are unit vectors, t...

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

A

`veca-vecb`

B

`veca+vecb`

C

`2veca-vecb`

D

`2veca+vecb`

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A
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