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Problem
Problem
If the equation
x
2
+
y
2
−
2
x
−
2
y
+
c
=
0
x^2 + y^2 - 2x - 2y + c = 0
x
2
+
y
2
−
2
x
−
2
y
+
c
=
0
represents an empty set, then find the value of
c
c
c
.
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