(3) For each region shown below, decide whether to use polar coordinates or rectangular J₁² f dA as an iterated integral, where fƒ is an arbitrary dxdy = rdrdo, and f(x, y) = coordinates and write continuous function on R. Remember that dA f(r cos(8), r sin(0)). (a) (b) -1 4 1 4 y=1-x² 1 X X (c) (d) = -1 У4 1. 0 6 1 X

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