$\"\"$

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The series is $\"\"$ .

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Consider the fraction $\"\"$ .

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$\"\"$ .

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Solve the fraction using partial fractions.

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$\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Equate the constant terms.

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$\"\"$ .

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Equate the coefficients of $\"\"$ .

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$\"\"$

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$\"\"$

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

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$\"\"$

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$\"\"$

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$\"\"$ .

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

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$\"\"$ .

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$\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$ .

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$\"\"$

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$\"\"$ .