3x If f(x)=2 cos(x), 0 x Find the width of each subinterval. units evaluate the left Riemann sum with n = 6, taking the sample points to be left endpoints. Find the left endpoints of the subintervals where x1 < x < ... < x6 x2 x6 Evaluate the Riemann sum. (Round your answer to six decimal places.) What does the Riemann sum represent? The Riemann sum represents the net area of the rectangles with respect to the -Select- Illustrate with a diagram. 314 3x 20-2 60-21 0-2 B