Book: RS Aggarwal - Mathematics
Chapter: 4. Inverse Trigonometric Functions
Subject: Maths - Class 12th
Q. No. 13 of Exercise 4B
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13
Find the principal value of each of the following :
[ Formula: cos (2π + x) = cos x , cos is positive in the first quadrant. ]
= 
[Formula: cos-1(cos x) = x]
= 
