(a)

The function is and the point is .

.

Apply derivative on each side with respect to .

.

Slope of the tangent is derivative of the function at the given point.

Point-slope form of line equation : .

Substitute and in the above formula.

Tangent line is .

(b)

The function is and the point is .

.

Apply derivative on each side with respect to .

.

Slope of the tangent is derivative of the function at the given point.

Point-slpoe form: .

Substitute and in the above formula.

Tangent line is . 

(a) Tangent line is .

(b) Tangent line is .