Approximate the area of the region bounded by the graph of f(t) = cos (t/2-3/8) and the t-axis on [/4,5x/4] with n=4 subintervals. Use the midpoint of each subinterval to determine the height of each rectangle (see figure). 1- 0.5- f(t)= cos(t/2-3/8) R2 3 2 2 The approximate area of the region is (Round to two decimal places as needed.)