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13. A region A is bounded by the hyperbolas (雙曲線) xy = 1 and xy = 2, and the curves xy² = 3 and xy² = 4. The area of A is denoted by area.. Use the change of variables u = ry and u = ay', the area of the image of the region A in the coordinate space determined by (u,v) under the transformation is called area_t. 請問下列哪些選項是正確的?
(A) area_o =In4-1n3
(B)
(C)
(D) The Jacobian determinant
(E)