6. （15％）Use the transformationu=xy ,v=x2-y2 to find where R is the region in the first quadrant that is enclosed by the hyperbolas x2-y2=1,x2-y2=4 and the circles x2+y2=9 , x2+y2=16.
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where R is the region in the first quadrant that is enclosed by the hyperbolas x2-y2=1,x2-y2=4 and the circles x2+y2=9 , x2+y2=16.