This video lecture from Fundamentals of Trigonometry (F.Sc. first year Mathematics) covers: Question numbers 4-5 of exercise 9.2. In these questions we find the the remaing values of trigonometric functions where the value of one trigonometric function is given. 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.