$\"\"$

\

The function is $\"\"$ .

\

Apply hyperbolic identity : $\"\"$ .

\

Substitute $\"\"$ in $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

Apply formula : $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

Apply formula : $\"\"$ .

\

$\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

Apply formula : $\"\"$ .

\

$\"\"$ .

\

$\"\"$

\

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