The curve is  and the point is .

The slope of the tangent line is the derivative of the curve.

Consider .

Differentiate the above curve with respect to .

.

Quotient rule of differentiation : .

The slope of the tangent line at  is

The equation of the tangent line at  :

Point - Slope form is , where  is slope and  is the point on the line.

Substitute   and  in above formula.

The equation of the tangent line at  is .