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17. Consider the following two functions: f: \mathbb{R}^{2} \rightarrow \mathbb{R}^{2}, f(x, y)=\left(\begin{array}{c}

2 x+2 y-1 \\

-x-y

\end{array}\right) g: \mathbb{R}^{2} \rightarrow \mathbb{R}, g(u, v)=u^{2}-4 v^{2} .

Fig: 1

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