$\vec{\mathbf{A}} \times \vec{\mathbf{B}}=$?

$\eta A B \ \cos \theta$

$\mathrm{AB} \sin \theta$

$-\vec{\mathrm{B}} \times \vec{\mathrm{A}}$

$\vec{\mathrm{B}} \times \overrightarrow{\mathrm{A}}$