This video lecture from Differentiation (F.Sc. second year Mathematics) covers: Questions 2-3 of exercise 2.5. In these questions we find derivative of trigonometric functions with respect to variable involved, find dy/dx by differentiating equation containing trigonometric functions. 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.