$\"\"$

\

The expression is $\"\"$ .

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Definition of hyperbolic trigonometry : $\"\"$ .

\

Substitue $\"\"$ in $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Hence $\"\"$

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Definition of hyperbolic trigonometry : $\"\"$ .

\

Substitue $\"\"$ and $\"\"$ in the above equation.

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$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

$\"\"$ .

\

$\"\"$ .

\

$\"\"$ .

\

$\"\"$ .