This video lecture from Vectors (F.Sc. second year Mathematics) covers: Question 11-12 of exercise 7.2. In these questions we find direction cosines of given vector, and we also show that three given angles are direction angles of a single vector. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.