Suppose f(x, y) = /xỹ and R is the rectangle with vertices (0,0), (6,0), (6,4), (0,4). In each part, estimate f(x, y) dA using Riemann sums. For underestimates or overestimates, R consistently use either the lower left-hand corner or the upper right-hand corner of each rectangle in a subdivision, as appropriate. (a) Without subdividing R, Underestimate = Overestimate = (b) By partitioning R into four equal-sized rectangles. Underestimate = Overestimate =

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