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JEE Advanced Mathematics question

MathematicsVector AlgebraJEE Advanced

Let and be three vectors having magnitudes 1, 1 and 2 respectively. If , the acute angle between and is

Answer: (C)

Solution

Let be the angle between ; then . Expanding,

(·) - (·) + = ⇒ = - 2θ .

Squaring: \ve$

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Question ID VK-109672