Last edited by mr fantastic; Mar 25th 2010 at 04:38 PM. Reason: Thread and post pruned.
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all right, then the region is the triangle with coordinates $\displaystyle (-2,0),(0,0)$ and $\displaystyle (1,1).$ perform the substitution $\displaystyle u=y+x$ and $\displaystyle v=y-x,$ compute the Jacobian and you'll get another triangle.
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