This video lecture from Fundamentals of Trigonometry (F.Sc. first year Mathematics) covers: Question numbers 3-5 of exercise 9.3. In these questions we verify the given trigonometric equations when angle is 30 degrees and 45 degrees. 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.