$\"\"$

\

The identity is $\"\"$ , $\"\"$ .

\

Consider $\"\"$ .

\

$\"\"$

\

$\"\"$

\

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

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Apply log on each side.

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

Substitute $\"\"$ .

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .