Fill in the blanks
The principal value of 
is ________.
The principal value of 
is 
.
Principal value of cos-1 x is [0, π]
Let, 
As, 
So, 
38
Fill in the blanks
The principal value of is ________.
The principal value of is .
Principal value of cos-1 x is [0, π]
Let,
As,
So,