Unless specified, all approximating rectangles are assumed to have the same width. Evaluate the upper and lower sums for f(x) = 1 + cos - SXST, with n = 3, 4, and 6. Illustrate each case with a sketch similar to the figure shown below. (Round your answers to two decimal places.) a b n = 3: upper sum lower sum Illustrate. 14 7 -TT л -TT л - л wi 3 3 3 wi 3 ci n = 4: upper sum lower sum Illustrate. FI л テ-2 л Nie л 2 O 2 л - NIE л E 5| 元-3 3 沉一。 3 元13 5 4. 一。 玩一3 K-3 元-3 F! E」的 51 3 n = 6: upper sum lower sum Illustrate. 元 0
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