$\"\"$

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The sequence is $\"\"$ .

\

$\"\"$

\

$\"\"$

\

If $\"\"$ then $\"\"$ .

\

$\"\"$

\

$\"\"$ .

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The value of $\"\"$ .

\

Therefore, the sequence is converges to $\"\"$ .

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$\"\"$

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The sequence is converges to $\"\"$ . \ \