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JEE Advanced Mathematics question

MathematicsVector AlgebraJEE Advanced

If and then the angle between and is

Answer: (B)

Solution

Adding the two equations: . Then .

Missing argument for \vec\vec a·Missing argument for \vec\vec b = 1 - Missing argument for \tfrac\tfrac19 = Missing argument for \tfrac\tfrac89, |Missing argument for \vec\vec a| =

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Question ID VK-109622