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How exactly do I do this? I thought all I did, for example with the first du, was set up 2 integrals, one for the dx part, and one for the dy part. I then thought for (i) the dx integral would go from (a->x) and the dy integral would go from (b->y), then for (ii) I would integrate the dx from (b->y) and the dy from (a->x). To be honest though I am really pretty lost and any advice would be much appreciated.