Question 4 - Examples - Chapter 3 Class 11 Trigonometric Functions
Last updated at Dec. 16, 2024 by Teachoo
Last updated at Dec. 16, 2024 by Teachoo
Question 4 Solve cos ๐ฅ = 1/2 Let cos x = cos y Given cos x = 1/2 From (1) and (2) cos y = 1/2 cos y = cos ๐/3 y = ๐/3 Rough We know that cos 60ยฐ = 1/2 So, 60ยฐ = 60 ร ฯ/180 = ฯ/3 Since cos x = cos y General Solution is x = 2nฯ ยฑ y where n โ Z Putting y = ๐/3 x = 2nฯ ยฑ๐ /๐ where n โ Z
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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo