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The function is $\"\"$ , $\"\"$ and $\"\"$ .

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$\"\"$

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

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$\"\"$ .

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Product rule of derivatives: $\"\"$ .

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$\"\"$

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Find $\"\"$ .

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

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$ .