The area A of the region S that lies under the graph of the continuous function is the limit of the sum of the areas of approximating rectangles. A= lim Rlim [f(x)Ax + f(x2)Ax+...+ f(x)Ax] 518 518 Use this definition with right endpoints to find an expression for the area under the graph of f as a limit. Do not evaluate the limit. f(x) = 9x cos(9x), 0 x 2 A = lim i-1