Solve the following questions and explain

3. If f'(x) = (2x -1)"(3x + 1)'(x -1), then f has which of the following relative extrema? I. A relative maximum at X = - 3 II. A relative minimum at X = N III. A relative minimum at x = 1 4. (Calc) Let f'(x) = (x -1) cos(x2 + 1). If c represents the largest value on the x-axis on [0, 2] where there is a point of relative extrema of f (x), and let d represents the smallest value on the x-axis on [0, 2] where there is a point of relative extrema of f (x), find the value of c - d