This video lecture from Trigonometric Identities (F.Sc. first year Mathematics) covers: Question numbers 2 of exercise 10.1. In this question we express the given trigonometric functions as a trigonometric function of an angle of positive degree measure of less than 45 degree. 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.