$\"\"$

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The function is $\"\"$ .

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Graph the function :

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$\"\"$

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Observe the graph:

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(a)

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As $\"\"$ tends to $\"\"$ , $\"\"$ approaches to $\"\"$ .

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(b)

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As $\"\"$ tends to $\"\"$ , $\"\"$ approaches to $\"\"$ .

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$\"\"$

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(a) $\"\"$ .

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(b) $\"\"$ .