Book: RS Aggarwal - Mathematics
Chapter: 4. Inverse Trigonometric Functions
Subject: Maths - Class 12th
Q. No. 15 of Exercise 4B
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15
Find the principal value of each of the following :
3
Putting the value of 
and using the formula
cot-1(-x)= π-cot-1x
= 
Putting the value of 
= 
= 
= 
=
