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Find the unit vector perpendicular to lt...

Find the unit vector perpendicular to ltbr. `vecA=3hati+2hatj-hatk` and `vecB=hati-hatj+hatk`

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`hateta=(vecAxxvecB)/(|vecAxxvecB|)=(hati-4hatj-5hatk)/(sqrt(1+16+25))=(hati-4hatj-5hatk)/(sqrt(42))`
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