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Identify the equation of the surface.
x
2
+
z
2
=
4
\displaystyle {x}^{{2}}+{z}^{{2}}={4}
x
2
+
z
2
=
4
y
2
+
z
2
=
4
\displaystyle {y}^{{2}}+{z}^{{2}}={4}
y
2
+
z
2
=
4
x
2
+
y
2
=
4
\displaystyle {x}^{{2}}+{y}^{{2}}={4}
x
2
+
y
2
=
4
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