Question

If |Ā + B| = |Ā – B| then the angle between A and
B is​

Answer 1

Answer:

Given  :      A.B=A×B             

Taking mod on both sides,      ∣A.B∣=∣A×B∣ 

OR      ∣A∣∣B∣cosθ=∣A∣∣B∣sinθ 

OR     sinθ=cosθ

OR     tanθ=1                   

⟹θ=45o