Calcule o produto misto $\mathbf{A \cdot ( B \times C) }$ dos vetores $\mathbf{A}$, $\mathbf{B}$ e $\mathbf{C}$:

$\mathbf{A =} \;$$\mathbf{(1, 2, 3)}$;
$\mathbf{B =} \;$$\mathbf{(1, 2, 3)}$;
$\mathbf{C =} \;$$\mathbf{(1, 2, 3)}$;

$\mathbf{A \cdot ( B \times C) =} \;$ $\left| \begin{array}{cc} \mathbf{-1} & \mathbf{2} \\ \mathbf{3} & \mathbf{-5} \end{array} \right| $ $\;=\;$