Use the change of variables x = u 2 v 2 , y = 2uv to
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Use the change of variables x = u2 – v2, y = 2uv to evaluate the integral ∫∫R y dA, where R is the region bounded by the x-axis and the parabolas y2 = 4 – 4x and y2 = 4 + 4x, y ≥ 0.
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