Class 10 Maths Chapter 8 Introduction to Trigonometry Ex 8.1 Question 1. In ∆ABC right angled at B, AB = 24 cm, BC = 7 cm. Determine: (i) sin A, cos A (ii) sin C, cos C Solution: Question 2. In given figure, find tan P – cot R. Solution: Question 3. If sin A = , calculate cos A and tan A. Solution: Question 4. Given 15 cot A = 8, find sin A and sec A. Solution: Question 5. Given sec θ = , calculate all other trigonometric ratios. Solution: Question 6. If ∠A and ∠B are acute angles such that cos A = cos B, then show that ∠A = ∠B. Solution: Question 7. If cot θ = , evaluate: (i) (ii) cot²θ Solution: Question 8. If 3 cot A = 4, check whether = cos² A – sin² A or not. Solution: Question 9. In triangle ABC, right angled at B, if tan A = , find the value of: (i) sin A cos C + cos A sin C (ii) cos A cos C – sin A sin C Solution: Question 10. In ΔPQR, right-angled at Q, PR + QR = 25 cm and PQ = 5 cm. Determine ...