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Mathematics
Mathematics
Problem
If
a
a
a
,
b
b
b
and
c
c
c
are coplanar, show
[
a
+
b
,
b
+
c
,
c
+
a
]
[a + b,\ b + c,\ c + a]
[
a
+
b
,
b
+
c
,
c
+
a
]
are coplanar.
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