Ex 2.1, 9 - Find principal value of cos-1 (-1/root 2) - Finding pricipal value

  1. Chapter 2 Class 12 Inverse Trigonometric Functions
  2. Serial order wise
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Ex 2.1, 9 Find the principal value of cos-1 ( 1/ 2) Let y = cos-1 ( 1/ 2) cos y = ( 1)/ 2 cos y = cos (3 /4) Range of principal value of cos-1 is between [0 , ] Hence the principal value is 3 /4

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