Use left and right endpoints and the given number of rectangles to find two approximations of the area of the region between the graph of the function and the x-axis over the given interval. (Round your answers to four decimal places. ) f(x) = cos(x), [0, π/2], 4 rectangles < Area <
![Use left and right endpoints and the given number of rectangles to find two approximations of the area of the region between the graph of the function and the x-axis over the given interval. (Round your answers to four decimal places. ) f(x) = cos(x), [0, π/2], 4 rectangles < Area](https://www.doubtrix.com/uploads/editor/6880319920WOAjDAOlyU.png)
![Use left endpoints and 12 rectangles to find the approximation of the area of the region between the graph of the function cos(10x) and the x-axis over the interval [0, π/10]. Round your answer to four decimal places. −0.0038 0.0462 0.0762 0.0262 −0.0138](https://www.doubtrix.com/uploads/editor/5558928179WpcbcExBJI.png)
![Use left endpoints and 10 rectangles to find the approximation of the area of the region between the graph of the function 2x2 − x − 1 and the x-axis over the interval [2, 13]. Round your answer to the nearest integer. 1,295 1,320 1,195 995 1,020](https://www.doubtrix.com/uploads/editor/3273524735YTjnwaYDpE.png)
