Exercise 4.3.3 Find an equation for the tangent line to f (x) = 312 1:3 atx = 4. Exercise 4.3.7 Find a cubic polynomial whose graph has horizontal tangents at (2,5) and (2,3). Exercise 4.3.10 Use the Product Rate to compute the derivative of f (x) = (2x 3)2. Sketch the function. Find an equation of the tangent tine to the curve at x = 2. Sketch the tangent iine atx = 2