Find the principal values of each of the following:
Let cosec–1
= y
⇒ cosec y = 
= cosec
The range of principal value of cosec–1 is 
–{0}
and cosec
Therefore, the principal value of cosec–1
is 
.
1
Find the principal values of each of the following:
Let cosec–1 = y
⇒ cosec y =
= cosec
The range of principal value of cosec–1 is –{0}
and cosec
Therefore, the principal value of cosec–1 is .