\

The function $\"\"$

\

Replace $\"\"$ with $\"\"$ .

\

$\"\"$

\

Interchange the variables $\"\"$ and $\"\"$ ,

\

$\"\"$

\

\

$\"\"$

\

Solve for $\"\"$ .

\

$\"\"$

\

Replace $\"\"$ with $\"\"$ .

\

$\"\"$ .

\

\

Check :

\

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

\

$\"\"$ $\"\"$

\

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

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

\

$\"\"$ .