Last updated at Dec. 8, 2016 by Teachoo
Transcript
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
About the Author