\
The function is
.
The domain of the function is
.
Find the inverse function.
\Change
to
.
.
Interchange the variables
and
.
.
Divide on each side by
.

Apply inverse trigonometric property:
.

Subtract each side by
.

Divide on each side by
.

Change
to
.
The inverse function is
.
\
Find the range of function.
\
.
.
Range of cosine function:
.
Therefore,
.

The range of
is
.
The range of
is equal to the domain of
.
The domain of
is
.
\
The inverse function is
.
The range of of
is domain of
.
The domain of
is
or
.
The range of
is
.
\
The inverse function is
.
The range of
is
.
The domain of
is
.
The range of
is
.