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Consider the triangular region R in the xy plane with vertices at (O, O),(l, 1) and (1, 2). (a) Find a transformation x = x(s, t), y = y(s, t) that sends the points (0, O),(1, O), and (O, 1) in the stplane to the points (0, O),(1, 1), and (1, 2) in the xyplane, respectively (b) Use the transformation T to find the area of the region R