Find the principal value of each of the following :
[Formula: cosec-1(-x) = -cosec-1(x) ]
= 
This can also be solved as
Since cosec is negative in the third quadrant, the angle we are looking for will be in the third quadrant.
= 
=
1
Find the principal value of each of the following :
[Formula: cosec-1(-x) = -cosec-1(x) ]
=
This can also be solved as
Since cosec is negative in the third quadrant, the angle we are looking for will be in the third quadrant.
=
=