\

The expression is $\"\"$ .

\

Consider $\"\"$ .

\

If $\"\"$ , then $\"\"$ .

\

Since $\"\"$ has the same range as $\"\"$ except where undefined.

\

$\"\"$ then $\"\"$ .

\

Thus,

\

$\"\"$

\

$\"\"$

\

$\"\"$ and $\"\"$ .

\

$\"\"$

\

Therefore, $\"\"$ .

\

\

$\"\"$ .