\

(a)

\

The function is $\"\"$

\

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

\

Chain rule of derivatives: $\"\"$ .

\

Find the value of $\"\"$ at $\"\"$ .

\

Obtain the required values from the table.

\

$\"\"$

\

$\"\"$ .

\

\

(b)

\

The function is $\"\"$ .

\

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

\

Chain rule of derivatives: $\"\"$ .

\

Find the value of $\"\"$ at $\"\"$ .

\

Obtain the required values from the table.

\

$\"\"$

\

$\"\"$ .

\

\

(a) $\"\"$ .

\

(b) $\"\"$ .