The function is
.
Find an equation for the inverse function.
\Let
and solve for
in terms of
.
Let
.
.
Differentiate on each side with respect to
.
.

The function
is
which can be neither positive or negative depending on the value of
.
The domain of
is
.
Since there is negative terms depending on the value of
, the function
is not monotonic.
is not a monotonic and it doesnot have an inverse function.
Inverse function of
does not exist because the function
is not a monotonic.