Processing math: 100%
f
(
x
,
y
)
=
y
2
−
x
2
4
f
(
x
,
y
)
=
sin
√
x
2
+
y
2
f
(
x
,
y
)
=
{
x
3
y
−
x
y
3
x
2
+
y
2
,
(
x
,
y
)
≠
(
0
,
0
)
;
0
,
(
x
,
y
)
=
(
0
,
0
)
.
f
(
x
,
y
)
=
e
−
y
/
4
cos
(
2
x
)
f
(
x
,
y
)
=
cos
(
2
x
)
−
cos
(
2
y
)
f
(
x
,
y
)
=
ln
(
4
(
x
2
+
y
2
)
)
−
2
Example 1
Example 2
Example 3
Example 4
Example 5
Example 6
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