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Ex 2.1, 5 - Find principal value of cos-1 (-1/2) - Inverse - Finding pricipal value

  1. Class 12
  2. Important Question for exams Class 12
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Ex 2.1, 5 Find the principal value of  cos-1 (−1/2) Let y = cos-1 (−1/2) cos y = −1/2 cos y = cos (2π/3). Range of principal value of cos-1 is [0 , 𝜋] Hence, the principal value is 2π/3.

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