Question 4 - Finding General Solutions - Chapter 3 Class 11 Trigonometric Functions

Last updated at April 16, 2024 by

Example 21 - Solve cos x = 1/2 - Trigonometric Functions CBSE

Example 21 - Chapter 3 Class 11 Trigonometric Functions - Part 2

Go Ad-free

Transcript

Question 4 Solve cos đ‘Ĩ = 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 × Ī€/180 = Ī€/3 Since cos x = cos y General Solution is x = 2nĪ€ Âą y where n ∈ Z Putting y = 𝜋/3 x = 2nĪ€ ±𝝅/𝟑 where n ∈ Z

Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

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