Solution
= Solution
The second component of the <gradient> forces $x=\pm1$. The first then requires $xy=1$. Apart from $(1,1)$, the only <stationary point> is
$$
\boxed{(-1,-1).}
$$
= Solution
The second component of the <gradient> forces $x=\pm1$. The first then requires $xy=1$. Apart from $(1,1)$, the only <stationary point> is
$$
\boxed{(-1,-1).}
$$