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Find the unit vector parallel to the res...

Find the unit vector parallel to the resultant of the unit vectors `vec(A) = 2 hati - 6 hatj - 3hatk` and `vec(B) = 4 hati +3hatj - hatk`.

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The correct Answer is:
`1//sqrt(61) (6hati - 3hatj - 4hatk)`
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