a) The rectangles in the graph below illustrate a The value of this Riemann sum is left endpoint -pi/2 4 3 2 1 0 -1 -2 -3 -5 Riemann sum for f(x) = 4 sin x on the interval [0, π]. pi/2 Pi 3pi/2 Left endpoint Riemann sum for y = 4 sin æ on [0, π]

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