Find a unit vector in the direction of t...

Find a unit vector in the direction of the resultant of the vectors `(hati+2hatj+3hatk),(-hati+2hatj+hatk) and (3hati+hatj)`.

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The correct Answer is:

`(3)/(5sqrt(2))hati+(5)/(5sqrt(2))hatj+(4)/(5sqrt(2))hatk`

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