Consider the family of functions defined by: f(x) = 13x² + cos(kx) for k>0 Note: Note k is lowercase (a) Determine the second-derivative of f. f"(x) = (b) Determine the minimum and maximum value of f"(x). Your answer will be in terms of k. Min value of f"(x): Max value of f"(x): (c) Determine if the following statements are true or false. (i) The maximum value of f"(x) will be positive for any positive value of k. ---Select--- (ii) There exists a positive value of k so that the minimum value of f"(x) is negative. ---Select--- ✓