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Mathematics
Problem
13. If
x
+
y
+
z
=
0
x+y+z=0
x
+
y
+
z
=
0
, show that
x
3
+
y
3
+
z
3
=
3
x
y
z
x^{3}+y^{3}+z^{3}=3 x y z
x
3
+
y
3
+
z
3
=
3
x
y
z
.
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