(a) The equation of the curve is  .

The slope of an tangent is the derivative of the curve at given point.

Quotient rule of differentiation:  .

The slope of the tangent line at  is

.

The equation of the tangent at :

Point - Slope form: .

Substitute  and  in above formula.

(b)

The graph of the function and its tangent line.

(a) The equation of the tangent at  is .

(b)

Graph the equation.

.