Let $\mathbf{a}$ be a unit vector.  Compute
\[\|\mathbf{a} \times \mathbf{i}\|^2 + \|\mathbf{a} \times \mathbf{j}\|^2 + \|\mathbf{a} \times \mathbf{k}\|^2.\]
Question:
Let $\mathbf{a}$ be a unit vector.  Compute
\[\|\mathbf{a} \times \mathbf{i}\|^2 + \|\mathbf{a} \times \mathbf{j}\|^2 + \|\mathbf{a} \times \mathbf{k}\|^2.\]
Answer:
Let's think step by step.

user
2
Let $\mathbf{a}$ be a unit vector.  Compute
\[\|\mathbf{a} \times \mathbf{i}\|^2 + \|\mathbf{a} \times \mathbf{j}\|^2 + \|\mathbf{a} \times \mathbf{k}\|^2.\]
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