$\"\"$

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(a) Need to verify $\"\"$ .

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Consider Left hand side $\"\"$ .

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Rewrite the expression as $\"\"$ .

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Let $\"\"$

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$\"\"$

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

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$\"\"$

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$\"\"$

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$\"\"$ .

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If $\"\"$ ,then $\"\"$ .

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If $\"\"$ , then $\"\"$ .

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

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Apply limits: $\"\"$ to $\"\"$ .

\

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$\"\"$

\

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$\"\"$

\

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$\"\"$

\

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$\"\"$

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= Right hand side.

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

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(b) Need to verify $\"\"$ .

\

Consider Left hand side $\"\"$ .

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Rewrite the expression as $\"\"$ .

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Let $\"\"$

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$\"\"$

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

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$\"\"$

\

$\"\"$

\

$\"\"$ .

\

If $\"\"$ ,then $\"\"$ .

\

If $\"\"$ , then $\"\"$ .

\

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

\

Apply limits: $\"\"$ to $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

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$\"\"$

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= Right hand side.

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

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(a) $\"\"$ .

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(b) $\"\"$ .