Step 1:

(a) The function is $\"\"$ .

Quotient Rule of derivatives: $\"\"$ .

$\"\"$

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

$\"\"$

Bring the terms containing $\"\"$ on one side.

$\"\"$

Step 1:

(b) The function is $\"\"$ .

Derivative formula: $\"\"$

$\"\"$

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

$\"\"$

Solution :

$\"\"$ .