$\"\"$

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(a)

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The function is $\"\"$ .

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

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$\"\"$

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The Product rule of the derivative: $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The derivative of the function with respect to $\"\"$ is $\"\"$ .

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$\"\"$

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(b)

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The function is $\"\"$

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

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$\"\"$

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The Product rule of the derivative: $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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(a) $\"\"$ .

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(b) $\"\"$ .