$\"\"$

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The function is $\"\"$ .

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The function is $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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The function is $\"\"$ .

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Differentiate on each side with respect to $\"\"$ .

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Definition of derivative is $\"\"$ .

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$\"\"$

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Therefore, the function $\"\"$ is the derivative of the $\"\"$ with $\"\"$ as small change $\"\"$ .

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Therefore $\"\"$ .

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$\"\"$

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Graph:

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Graph the function $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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Therefore $\"\"$ .