39. Let's call them $\mathbf{a}$ and $\mathbf{b}$:
$$\mathbf{a} = \begin{pmatrix} 1 \\ 2 \\ 3 \end{pmatrix}, \quad \mathbf{b} = \begin{pmatrix} 2 \\ -1 \\ 4 \end{pmatrix}$$
The cross product of $\mathbf{a}$ and $\mathbf{b}$ is given by:
$$\mathbf{a} \times
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