The angle between A = cap i+ cap j and B = cap i - cap j is
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Draw both the vectors !
costheta = [(i+j).(i-j)]/ (magnitude of i+j).(magnitude of i-j)
i.e,costheta=0
theta = 90
costheta = [(i+j).(i-j)]/ (magnitude of i+j).(magnitude of i-j)
i.e,costheta=0
theta = 90
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