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The following function is positive and negative on the given interval. f(x) = sin 3x; 2 a. Sketch the function on the given interval. b. Approximate the net area bounded by the graph of f and the x-axis on the interval using a left, right, and midpoint Riemann sum with n = 4. C. Use the sketch in part (a) to show which intervals of 72x make positive and negative contributions to the net area. b. Use a calculator to approximate the area. The net area, approximated using the left Riemann sum with n = 4, is (Do not round until the final answer. Then round to three decimal places as needed.) Use a calculator to approximate the area. The net area, approximated using the right Riemann sum with n = 4, is (Do not round until the final answer. Then round to three decimal places as needed.) Use a calculator to approximate the area. The net area, approximated using the midpoint Riemann sum with n = 4, is (Do not round until the final answer. Then round to three decimal places as needed.) c. Which intervals of 7,2nt make positive and negative contributions to the net area