If $\vec{A} \times \vec{B}=\vec{B} \times \vec{A}$, then the angle between $A$ and $B$ is

If $\vec{A} \times \vec{B}=\vec{B} \times \vec{A}$, then the angle between $A$ and $B$ is
  1. $\pi$
  2. $\pi / 3$
  3. $\pi / 2$
  4. $\pi / 4$

Solution

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Asked in: JEE Main 2004

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