estion 6 of 33 > BFW Publishers Approximate the area A under the graph of the function f from a to b for n = 4 and n = 8 subintervals: f(x) = cos(x) on (a) By using lower sums sn (rectangles that lie below the graph of f). (Round your answers to 3 decimal places.) $4 Incorrect 1.896 58 2 1.974 Incorrect (b) By using upper sums S, (rectangles that extend above the graph of f). (Provide your answers to 3 decimal places.) S4 1.896 Incorrect S8 1.974 Incorrect Attempt 1