$\"\"$

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The function is $\"\"$ .

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Let $\"\"$ .

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Differentiate with respect to $\"\"$ .

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$\"\"$

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Substitute $\"\"$ and $\"\"$

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$\"\"$

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$\"\"$

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Substitute $\"\"$ in the above equation.

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$\"\"$

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Thus, $\"\"$

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$\"\"$

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$\"\"$ .