Question: A unit vector n on the xy plane is at an angle of 120 degree w.r.t I. The angle between the vectors u= al+bn

A unit vector n on the xy plane is at an angle

A unit vector n on the xy plane is at an angle of 120 degree w.r.t I. The angle between the vectors u= al+bn & v= an+bi will be 60 degree if

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