(a)

The statement is .

Consider .

Rewrite the function.

.

Apply derivative on each side with respect to .

.

Power rule of derivatives : .

.

(b)

The function .

Consider .

.

Apply derivative on each side with respect to .

.

Power rule of derivatives : .

.

(c)

The function .

Consider .

Apply derivative on each side with respect to .

Quotient rule of derivatives : .

.

(a) .

(b) .

(c) .