\[[(\mathbf{a}\times \mathbf{b})\times (\mathbf{b}\times \mathbf{c})\,(\mathbf{b}\times \mathbf{c})\times (\mathbf{c}\times \mathbf{a})\,(\mathbf{c}\times \mathbf{a})\times (\mathbf{a}\times \mathbf{b})]=\,\]

\[{{[\mathbf{a}\,\,\mathbf{b}\,\,\mathbf{c}]}^{2}}\]

\[{{[\mathbf{a}\,\,\mathbf{b}\,\,\mathbf{c}]}^{3}}\]

\[{{[\mathbf{a}\,\,\mathbf{b}\,\,\mathbf{c}]}^{4}}\]

\[[(\mathbf{a}\times \mathbf{b})\times (\mathbf{b}\times \mathbf{c})\,

1.	\[[(\mathbf{a}\times \mathbf{b})\times (\mathbf{b}\times \mathbf{c})\,(\mathbf{b}\times \mathbf{c})\times (\mathbf{c}\times \mathbf{a})\,(\mathbf{c}\times \mathbf{a})\times (\mathbf{a}\times \mathbf{b})]=\,\]
A.	\[{{[\mathbf{a}\,\,\mathbf{b}\,\,\mathbf{c}]}^{2}}\]
B.	\[{{[\mathbf{a}\,\,\mathbf{b}\,\,\mathbf{c}]}^{3}}\]
C.	\[{{[\mathbf{a}\,\,\mathbf{b}\,\,\mathbf{c}]}^{4}}\]
D.	None of these
Answer» D. None of these

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\[[(\mathbf{a}\times \mathbf{b})\times (\mathbf{b}\times \mathbf{c})\,(\mathbf{b}\times \mathbf{c})\times (\mathbf{c}\times \mathbf{a})\,(\mathbf{c}\times \mathbf{a})\times (\mathbf{a}\times \mathbf{b})]=\,\]

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