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Mathematics
Problem
Determine the value of
k
k
k
for which the curve
x
y
+
k
x
2
=
4
xy + kx^{2} = 4
x
y
+
k
x
2
=
4
has a horizontal tangent at the point
(
2
,
4
)
(2,4)
(
2
,
4
)
.
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