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Mathematics
Mathematics
Problem
Find the equation of the tangent to the curve
x
2
+
x
y
+
y
2
=
7
x^{2}+xy+y^{2}=7
x
2
+
x
y
+
y
2
=
7
at the point
(
2
,
1
)
(2,1)
(
2
,
1
)
.
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