The cross product is defined by
1 $$\vec{A} \cdot \vec{B} = AB \cos \theta$$
2 $$\vec{A} \times \vec{B} = AB \sin \theta$$
3 $$\vec{A} \times \vec{B} = AB \cos \theta$$
4 $$\vec{A} \times \vec{B} = (AB \sin \theta)\hat{u}$$
O A.1
O B.2
O C.3
O D.4
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