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Write a unit vector in the direction of ...

Write a unit vector in the direction of ` vec b=2 hat i+ hat j+2 hat kdot`

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Unit vector in the direction of `vec b` is,
`={ 2 hat i+ hat j+2 hat k}/sqrt{2^2+1^2+2^2}`
`= {2 hat i+ hat j+2 hat k}/3`
`= 2/3 hat i+1/3hat j+2 /3hat k`
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