Find unit vectors perpendicular to the vectors `2hati - 3hatj + 4hatk` and `4hati - hatj - 2hatk`.

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

Find a unit vector perpendicular to both veca and vecb .

Find a vector perpendicular to both veca and vecb .

Find the angle between the vector 2 hati+ 3hatj+ hatk and 2 hati - hatj- hatk .

Find the measure of the angle between the vectors 3 hati + 2 hatj + 2hatk and 2 hati - hatj - 2 hatk .

Find the projection of the vector hati + 3hatj + 7 hatk on the vector 7 hati -hatj + 8 hatk .

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

Find the unit vector along the vector hati + hatj + hatk.

Show that vector bar A = 2hati - 3hatj + 4 hatk and bar B = 6hati -9hatj + 12hatk are parallel.