(Solved): Approximate the area of the region bounded by the graph of \( \mathrm{f}(\mathrm{t})=\cos (\mathrm ...

Approximate the area of the region bounded by the graph of \( \mathrm{f}(\mathrm{t})=\cos (\mathrm{t} / 2) \) and the \( \mathrm{t} \)-axis on \( [0, \pi] \) with \( n=4 \) subintervals. Use the midpoint of each subinterval to determine the height of each rectangle (see figure). The approximate area of the region is (Round to two decimal places as needed.)