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

`(veci-vecj+veck)/(sqrt(5))`

B

`(2veci+vecj)/(sqrt5)`

C

`(2veci-vecj+veck)/(sqrt(5))`

D

`(2veci-vecj)/(sqrt(5))`

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