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  1. Chapter 2 Class 12 Inverse Trigonometric Functions
  2. Serial order wise


Example 1 Find the principal value of sin–1 (1/√2). Let y = sin–1 (1/√2) sin y = 1/√2 sin y = sin (𝜋/4) Range of principal value of sin −1 is between (−𝜋)/2 and ( 𝜋)/2 Hence, principal value is 𝝅/𝟒 Rough We know that sin 45° = 1/√2 θ = 45° = 45 × 𝜋/180 = 𝜋/4 Since 1/√2 is positive Principal value is θ i.e. 𝜋/4

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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.