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The expression is $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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Apply partial decomposition.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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Equate the $\"\"$ coefficients.

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$\"\"$

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$\"\"$ .

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Equate the constant terms.

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$\"\"$

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Substitute $\"\"$ .

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$\"\"$

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

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$\"\"$ .