Fuente TeX:
\vec{a} \times \vec{b} = a_x \hat{i} \times ( b_y \hat{j}+ b_z \hat{k} ) + a_y \hat{j} \times ( b_x \hat{i} + b_z \hat{k} ) + a_z \hat{k} \times ( b_x \hat{i} + b_y \hat{j})