1. Find a closed-form expression for the function b S[1,b](x8). 9 2. Write an expression for L 0, 2 (cos x). You DO NOT need to evaluate. 13 (05 (7) 3a. Recall that U [-3, 0] (9-x) is the upper sum approximation of the area under the curve y = 9-x2 between -3 and 0 using six subdivisions. On the graph at the right, sketch the rectangles whose areas make up U [-3, 0] (9 ). b. Compute U[-3, 0](9-x). 2.75 +5 +6.75 +8 +8.75 + 9 ) / 2 4= 15 6- y X -2-1 1 2 a c. On the graph to the right, sketch the rectangles whose areas make up L-3, 01(9-x2), the lower sum approximation of the area under the curve y = 9-x2 between -3 and 0 using six subdivisions. d. Compute 6-3,0](9-x). -2-1 X 1 2