$\"\"$

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The function is $\"\"$ .

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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Derivative of a logarithmic function : $\"\"$

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$\"\"$

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$\"\"$

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The value of $\"\"$ at $\"\"$ .

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$\"\"$

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$\"\"$

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The value of $\"\"$ is $\"\"$ .