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The equation is $\"\"$ .

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Substitute $\"\"$ in above equation.

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$\"\"$

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Therefore we have, $\"\"$ .

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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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Substitute $\"\"$ in above expression.

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$\"\"$

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$\"\"$ .

\

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$\"\"$ .