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Mathematics
Problem
For the relation
x
2
+
y
2
−
x
y
=
1
x^{2}+y^{2}-xy=1
x
2
+
y
2
−
x
y
=
1
, find all points
(
x
,
y
)
(x,y)
(
x
,
y
)
on the curve where
d
2
y
d
x
2
=
0
\frac{d^{2}y}{dx^{2}}=0
d
x
2
d
2
y
=
0
and
d
y
d
x
\frac{dy}{dx}
d
x
d
y
is defined.
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