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Let us assume the value of
, then
we have
or
and the range of the principal values of
lies between ![\left [ \frac{-\pi}{2},\frac{\pi}{2} \right ] - \left \{ 0 \right \}](https://learn.careers360.com/latex-image/?%5Cleft%20%5B%20%5Cfrac%7B-%5Cpi%7D%7B2%7D%2C%5Cfrac%7B%5Cpi%7D%7B2%7D%20%5Cright%20%5D%20-%20%5Cleft%20%5C%7B%200%20%5Cright%20%5C%7D)
.
hence the principal value of
is 
.