$\"\"$

\

The function is $\"\"$ .

\

Apply first derivative on each side.

\

$\"\"$

\

$\"\"$ .

\

Apply second derivative on each side.

\

$\"\"$

\

$\"\"$

\

Substitute $\"\"$ in the above equation.

\

$\"\"$

\

Apply third derivative on each side.

\

$\"\"$

\

$\"\"$ .

\

Therefore, $\"\"$ .

\

$\"\"$

\

$\"\"$ .