(a) The function is .

Apply derivative on each side with respect to .

.

(b)

The mechanic formula for  is .

The approximations are in the given table.

	\ \
	\ \
	\ \
	\ \

.

The mechanic formula for  is .

The approximations are in the given table.

	\ \
	\ \
	\ \
	\ \
	\ \

.

(a) .

(b)  and .