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  1. Chapter 3 Class 11 Trigonometric Functions
  2. Serial order wise

Transcript

Example 21 Solve cos ๐‘ฅ = 1/2 Let cos x = cos y Given cos x = 1/2 From (1) and (2) cos y = 1/2 cos y = cos ๐œ‹/3 y = ๐œ‹/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 โˆˆ Z Putting y = ๐œ‹/3 x = 2nฯ€ ยฑ๐…/๐Ÿ‘ where n โˆˆ Z

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.