[² f(x) dx, where f is the function whose graph is shown. The estimates were 0.7818, 0.8684, 0.8631, and 0.9550, and the The left, right, trapezoidal, and midpoint rule approximations were used to estimate same number of subintervals were used in each case. y y = f(x) @ (a) Which rule produced which estimate? Ln = M₁ = (b) Between which two approximations does the true value of + [²1(x) d f(x) dx lie? smaller value larger value

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