$\"\"$

(a)

The parametric equations are $\"\"$ and $\"\"$ .

The function is $\"\"$ .

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

The chain rule of derivatives : $\"\"$ . $\"\"$

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

$\"\"$ .

$\"\"$

(b)

The function is $\"\"$ .

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

$\"\"$

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

$\"\"$

$\"\"$ .

$\"\"$

(a) $\"\"$ .

(b) $\"\"$ .