Question

If and then find a unit vector perpendicular to both of the vectors and = +

Answer 1

Answer:

For two vectors with Direction Cosines as (l1,m1,n1) and (l2,m2,n2) ; it is necessary that the sum of the product of respective direction cosines is zero. However if a vector A is perpendicular to given vector then –A is also perpendicular to it in opposite direction.