10th mathematics exercise questions with answers

Trigonometry Exercise 13.4 – Class 10

Trigonometry Exercise 13.4 – Solutions: Evaluate: tan65˚/cot25˚ sin18˚/cos72˚ iii. cos48˚- sin42˚ cosec31˚ - sec59˚ cot34˚ - tan56˚ sin36˚/cos54˚ - sin54˚/cos36˚ vii. sec70˚ sin20˚ - cos70˚cosec20˚ viii. cos213˚ - sin277˚   Prove that: sin35˚ sin55˚ - cos35˚cos55˚ = 0 tan10˚tan15˚tan75˚tan80˚ = 1 iii. cos38˚cos52˚ - sin38˚sin52˚ = 0   III. If sin5θ = cos4θ, where 4θ… Continue reading Trigonometry Exercise 13.4 – Class 10