$\"\"$

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The expression is $\"\"$

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Evaluate the limit .

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$\"\"$ .

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$\"\"$

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Substitute $\"\"$ and $\"\"$ in the above expression.

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$\"\"$ .

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Since $\"\"$ if $\"\"$ .

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$\"\"$

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Therefore , $\"\"$ .

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$\"\"$

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$\"\"$ .