$\"\"$

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The functions are $\"\"$ , $\"\"$ and $\"\"$ .

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Graph the functions:

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$\"\"$

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Observe the graph:

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

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

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The magnitudes of $\"\"$ and $\"\"$ are approximately equal when $\"\"$ is close to $\"\"$ .

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Therefore, their ratio is approximately equal to $\"\"$ .

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$\"\"$ .

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$\"\"$ .

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$\"\"$ .

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$\"\"$ $\"\"$ .