It is known that the angle between the unit vector m and N is 60 degrees. It is proved that (2n-m) is perpendicular to m and its geometric meaning is explained thx/ .\

Let m = (1,0), n = (1 / 2,1 / root 3)
2n-m = (0, root 3)
(0, root 3) * m = 0
vertical
Geometric meaning:
Just draw a picture

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