Compute $\begin{pmatrix} 4 \\ 5 \\ -1 \end{pmatrix} \times \begin{pmatrix} 4 \\ 5 \\ -1 \end{pmatrix}.$
Question:
Compute $\begin{pmatrix} 4 \\ 5 \\ -1 \end{pmatrix} \times \begin{pmatrix} 4 \\ 5 \\ -1 \end{pmatrix}.$
Answer:
Let's think step by step.

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\begin{pmatrix} 0 \\ 0 \\ 0 \end{pmatrix}
Compute $\begin{pmatrix} 4 \\ 5 \\ -1 \end{pmatrix} \times \begin{pmatrix} 4 \\ 5 \\ -1 \end{pmatrix}.$
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