Find a unit vector perpendicular to each...

Find a unit vector perpendicular to each of the vector `veca+vecbandveca=3hati+2hatj+2hatkandvecb=hati+2hatj-2hatk`.

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The correct Answer is:

`+-(2)/(3)hati+-(2)/(3)hatj+-(1)/(3)hatk`

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