Let be the angle between two unit vectors a and b . If a +2 b is perpendicular to 5 a -4 b , then what is + 2 equal to?

NDA 2024 Mathematics question

Let be the angle between two unit vectors and . If is perpendicular to , then what is equal to?

Answer: (A)

\vec\vec\vec\vec\vec\vec\vec\vec$ b|^2 = 0 ⇒

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Question ID VK-029944