Fuente TeX:

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