Let a and b are two unit vectors such that a +2 b and 5 a -4 b are perpendicular. What is the angle between a and b ?

NDA 2022 Mathematics question

Let and are two unit vectors such that and are perpendicular. What is the angle between and ?

Answer: (C)

\vec\vec\vec\vec\vec\vec\vec\vec$ b|^2 =

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Question ID VK-029478