$\"\"$

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The function is $\"\"$ .

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

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$\"\"$

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Apply product rule of differentiation: $\"\"$ .

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In this case $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .