Book: RD Sharma - Mathematics (Volume 1)
Chapter: 4. Inverse Trigonometric Functions
Subject: Maths - Class 12th
Q. No. 3 of Exercise 4.3
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3
Evaluate each of the following:
We know that, for any x 
R, 
represent an angle in 
whose tangent is x.
,
and,
[
= 
Now, 
becomes,
= 
= 
= 
= 
Therefore the principle value of 
is 
.
