If A→ ×  B→ = B→ ×A→ then the angle between A and B is

We know that A→×B→  =−(  B→ ×A→ ) because the angle between these two is always 900. But if the angle between A→ and B→ is 0 or π. Then  A→ × B→  =  B→ ×A→  = 0