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Questions  

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

a
π2
b
π3
c
π
d
π4

detailed solution

Correct option is C

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

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