The angle between two vectors given by `6bari+6barj-3bark` and `7bari+4barj+4bark` is

Find the angle between the vectors bari+2barj+3bark" and "3bari-barj+2bark .

If the angle between the vectors bari+bark and bari-barj+abark " is " pi/3 , then a =

The angle between the line barr=(2bari-barj+bark)+lambda(bari-barj+bark) and the plane barr.(3bari+2barj-bark)=4 is

The angle between the planes barr.(2bari+barj+bark)=5, (bari-barj+2bark)=3 is

Find unit vector orthogonal to the vector 3bari + 2barj + 6bark and coplanar with the vectors 2bari + barj+bark and bari - barj + bark .

If the position vectors of A,B and C are respectively 2bari-barj+bark, bari -3barj-5bark and 3bari - 4barj - 4bark, " then " cos^(2) A =