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Foundations
hard
0:00.0
If
x
+
y
=
3
x+y=3
x
+
y
=
3
and
x
y
=
2
xy=2
x
y
=
2
, find
x
3
+
y
3
x^3+y^3
x
3
+
y
3
.
A
9
B
11
C
7
D
15
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