$\"\"$

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(a)

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The function is $\"\"$ .

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Differentiate on each side with respect to $\"\"$ .

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$\"\"$

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$\"\"$

\

$\"\"$ .

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$\"\"$

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(b)

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The function is $\"\"$ .

\

Differentation on each side with respect to $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

(a) $\"\"$ .

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(b) $\"\"$ .