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Find a unit vector which is perpendicula...

Find a unit vector which is perpendicular to both the vectors `2hati + hatj - hatk` and `3hati + 4hatj - hatk`.

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Find a unit vector perpendicular to both veca and vecb .

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Find a vector perpendicular to both veca and vecb .

What is the angle between vectors veca = hati - hatj + hatk and vecb = hati + hatj - hatk ?

Write a unit vector in direction of the sum of vectors veca = 2hati - hatj+ 2hatk and vecb= - hati +hatj+3 hatk .

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