$\"\"$

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Find the derivative of $\"\"$ .

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$\"\"$

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The product rule of derivative : $\"\"$ .

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$\"\"$ and $\"\"$ .

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

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Substitute all tha above values into the function $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .