$\"\"$ .

\

$\"\"$

\

Use product rule : $\"\"$ .

\

$\"\"$

\

$\"\"$

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Use formulas : $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

Therefore, $\"\"$ $\"\"$ .

\

.

\

\