Question: Problem #8: Use Jacobian to evaluate

\[\iint\limits_{R}{\exp }\left( \frac{y-x}{y+x} \right)dydx\]

where R is the triangular region in the first octant bounded between \(y=-x+1,\,\,y=-x+2\). Use

\[\begin{aligned} & u=y-x \\ & v=y+x \\ \end{aligned}\]