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Problem
Problem
Find all the solutions of
x
,
y
x, y
x
,
y
in the equation
4
(
3
4
x
−
x
2
sin
2
(
x
+
y
2
)
+
2
cos
(
x
+
y
)
)
=
13
+
4
cos
2
(
x
+
y
)
4 \left( 3\sqrt{4x - x^2} \sin^2 \left( \frac{x+y}{2} \right) + 2 \cos(x+y) \right) = 13 + 4 \cos^2(x+y)
4
(
3
4
x
−
x
2
sin
2
(
2
x
+
y
)
+
2
cos
(
x
+
y
)
)
=
13
+
4
cos
2
(
x
+
y
)
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