Trigonometry 3 NDA PYQs

00:00 - Introduction to Trigonometry PYQs (2016-2017) 00:11 - Question 1: Product of sin(70)sin(50)cos(60)cos(80) 03:25 - Question 2: Sum of sin(θ) = 4, find cos(θ) sum 04:53 - Question 3: Simplifying Product of (1 + cos(kπ/8)) 08:24 - Question 4: Simplifying sin(a) + 2sin(2a) + sin(3a) 11:44 - Question 5: Finding (x sinθ - y cosθ) value 14:14 - Question 6: Evaluating cos(2 cos⁻¹(0.8)) 15:26 - Question 7: Height & Distance: Hill observed from a Building 18:56 - Question 8: Finding sin(81°) given sin(18°) 23:53 - Question 9: Simplifying tan/cot expression 26:30 - Question 10: Speed of a Boat from a Cliff (Angle of Depression) 29:21 - Question 11: Finding cos(A/2) given sin(A) and range 32:31 - Question 12: Evaluating (√3 cosec 20° - sec 20°) 34:00 - Question 13: Distance between Boat and Light House 35:10 - Question 14: Maximum value of (sin(x+π/6) + cos(x+π/6)) 37:00 - Question 15: Evaluating product of sin(kπ/18) 39:11 - Question 16: Simplifying (sinα + sinβ) / (cosα + cosβ) 39:58 - Question 17: Finding (tan(θ+α) + 2tanα) given sin relationship 42:30 - Question 18: Finding tan(18°) value 44:01 - Question 19: Relation between x, y, z in GP and tan⁻¹ in AP 46:16 - Question 20: Finding tan(2α) given tan sum/diff 47:58 - Question 21: Trigonometric properties in Triangle ABC 49:40 - Question 22: Solving (secθ - cosecθ = 4/3) for (sinθ - cosθ) 54:12 - Question 23: Height of Cloud from Lake (Reflection) 58:35 - Question 24: Simplifying tan expression (9, 27, 63, 81 degrees) 01:02:06 - Question 25: Evaluating (√3 cosec 20° - sec 20°) 01:03:41 - Question 26: Finding sin(x) given tan(a)/tan(b) ratio