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JEE Advanced Mathematics question

MathematicsVector AlgebraJEE Advanced

Let . Then the angle between and is

Answer: (B)

Solution

1 = |Missing argument for \vec\vec a - Missing argument for \vec\vec b|^2 = |Missing argument for \vec\vec a|^2 + |Missing argument for \vec\vec b|^2 - 2Missing argument for \vec\vec a·Missing argument for \vec\vec b = 2 - 2Missing argument for \vec\vec a·Missing argument for \vec\vec b ⇒ Missing argument for \vec\vec a·Missing argument for \vec\vec b = Missing argument for \tfrac\tfrac12.

So $

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Question ID VK-109620