$\"\"$

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The expression is $\"\"$ .

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Denominator is always positive.

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As $\"\"$ , then numertor results a negative value.

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$\"\"$

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$\"\"$

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As $\"\"$ , then $\"\"$ .

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$\"\"$

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Evaluate the limits.

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .