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Problem
Problem
Find all pairs of
x
,
y
x, y
x
,
y
that satisfy the equation
cos
x
+
cos
y
+
cos
(
x
+
y
)
=
−
3
2
\cos x + \cos y + \cos(x+y) = -\frac{3}{2}
cos
x
+
cos
y
+
cos
(
x
+
y
)
=
−
2
3
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