Suppose that
f
(
x
,
y
)
=
x
4
+
y
4
−
2
x
y
\displaystyle {f{{\left({x},{y}\right)}}}={x}^{{4}}+{y}^{{4}}-{2}{x}{y}
f
(
x
,
y
)
=
x
4
+
y
4
−
2
x
y
Then the minimum is
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Enter DNE for Does Not Exist, oo for Infinity