Derive Composite Simpson's 3/8 Method (Equation 9.22) using a cubic (3rd order) polynomial (p(x) = C3x3 + C2x2 + C1x1 + Co. IUS)[romaes) + S&, 1+2E 16) + som] 0:2) -4.7.1 A 3rd order polynomial can be determined from four points. For an integral over the domain [a, b], the four points used are the two endpoints x1=a and X4=b, and two points X2 and x3 that divide the interval into three equal sections