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Step 1:

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The differential function is $\"\"$ .

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Rewrite the differential function is $\"\"$ .

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

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$\"\"$

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Use power rule : $\"image\"$ .

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$\"\"$

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or

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$\"\"$ \ \

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Step 2:

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(a)

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Find the value of $\"image\"$ when $\"\"$ and $\"\"$ .

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Substitute $\"\"$ and $\"\"$ in $\"\"$ .

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$\"\"$

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Step 3:

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(b)

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Here consider $\"\"$ not $\"\"$ .

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Find the value of $\"image\"$ when $\"\"$ and $\"\"$ .

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Substitute $\"\"$ and $\"\"$ in $\"\"$

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$\"\"$

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Find $\"\"$ .

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Substitute $\"\"$ and $\"\"$ in the $\"\"$ .

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$\"\"$

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Solution :

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(a) $\"\"$

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(b) $\"\"$

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$\"\"$

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