$\"\"$

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The series is $\"\"$ .

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Rewrite the series as $\"\"$ .

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The maclaurin series of $\"\"$ is $\"\"$ , $\"\"$ .

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Consider $\"\"$ .

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Substitute $\"\"$ in above series.

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$\"\"$

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$\"\"$ .

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Thus, the sum of series $\"\"$ .

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$\"\"$

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The sum of series $\"\"$ .