This video lecture from Differentiation (F.Sc. second year Mathematics) covers: Question 4-5 of exercise 2.4. In these questions we prove one differential equation from given two parametric equations, find derivative of one function with respect to another function using chain rule. 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.