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If vecA=hati+4hatj+hatk and vecB=3hati-5...

If `vecA=hati+4hatj+hatk and vecB=3hati-5hatj+hatk`, find the unit vector along any vector parallel to the resultant of `vecA and vecB`.

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The correct Answer is:
`4/sqrt(21)hati-1/sqrt(21)hatj+2/sqrt(21)hatk`
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