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The unit vector parallel to the resultan...

The unit vector parallel to the resultant of the vectors `hati+hatj-hatk " "" and"" " hati-2hatj+hatk`is

A

`(2hati-hatj+hatk)/sqrt5`

B

`(2hati-hatj)/sqrt5`

C

`(hati-hatj+hatk)/sqrt5`

D

`(2hati+hatj)/sqrt5`

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