$\"\"$

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The functions are $\"\"$ and $\"\"$ .

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(a) The function is $\"\"$ .

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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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$\"\"$

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Substitute $\"\"$ in the above expression.

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$\"\"$ .

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We have , $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ .

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Substitute above values in above expression.

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$\"\"$

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$\"\"$

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$\"\"$

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(b) $\"\"$ .

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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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$\"\"$

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Substitute $\"\"$ in the above expression.

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$\"\"$

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Substitute corresponding values in the above expression.

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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) $\"\"$ .