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Example 21 - Chapter 3 Class 11 Trigonometric Functions (Term 2)
Last updated at March 22, 2023 by Teachoo
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Chapter 3 Class 11 Trigonometric Functions
Serial order wise
- Ex 3.1
- Ex 3.2
- Ex 3.3
- Ex 3.4
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- Miscellaneous
Transcript
Example 21 Solve cos 𝑥 = 1/2 Let cos x = cos y Given cos x = 1/2 From (1) and (2) cos y = 1/2 cos y = cos 𝜋/3 y = 𝜋/3 Rough We know that cos 60° = 1/2 So, 60° = 60 × π/180 = π/3 Since cos x = cos y General Solution is x = 2nπ ± y where n ∈ Z Putting y = 𝜋/3 x = 2nπ ±𝝅/𝟑 where n ∈ Z
