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If vec(a) and vec(b) are two unit vector...

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

A

`(hat(a)- hat(b))`

B

`(hat(a)+ hat(b))`

C

`(2 hat(a) - hat(b))`

D

`(2 hat(a) + hat(b))`

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A
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