Fill in the blanks
The value of 
is ________.
The value of 
is 
We need, 
Principal value of cos-1 x is [0,π]
Also, cos (2nπ + θ) = cos θ for all n Є N
So, 
43
Fill in the blanks
The value of is ________.
The value of is
We need,
Principal value of cos-1 x is [0,π]
Also, cos (2nπ + θ) = cos θ for all n Є N
So,