JEE Advanced Mathematics question

MathematicsVector AlgebraJEE Advanced

If , and then is

Answer: (B)

Solution

By the parallelogram law,

|Missing argument for \vec\vec a + Missing argument for \vec\vec b|^2 + |Missing argument for \vec\vec a - Missing argument for \vec\vec b|^2 = 2(|Missing argument for \vec\vec a|^2 + |Missing argument for \vec\vec

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Question ID VK-109635