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

  1. Chapter 2 Class 12 Inverse Trigonometric Functions
  2. Serial order wise
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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 (2 /3). Range of principal value of cos-1 is [0 , ] Hence, the principal value is 2 /3.

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