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If vec a and vec b are unit vectors such...

If `vec a` and `vec b` are unit vectors such that ` theta` is the angle between then, `|vec a - vec b| =`

A

`2 cos theta`

B

`2 sin theta`

C

` (cos) theta/2`

D

`2 (sin) theta/2`

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The correct Answer is:
D
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