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Mathematics
Mathematics
Problem
Show that the vectors
a
×
(
b
×
c
)
\mathbf{a} \times (\mathbf{b} \times \mathbf{c})
a
×
(
b
×
c
)
,
b
×
(
c
×
a
)
\mathbf{b} \times (\mathbf{c} \times \mathbf{a})
b
×
(
c
×
a
)
and
c
×
(
(
a
×
b
)
)
\mathbf{c} \times ((\mathbf{a} \times \mathbf{b}))
c
×
((
a
×
b
))
are coplanar.
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