To find $\"\"$ ,

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use a substitution $\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Multiply numerator and denominator by $\"\"$ .

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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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