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JEE Main 2015 Mathematics question

MathematicsVector AlgebraJEE Main 2015

In a parallelogram , , & . has the value:

Answer: (4)

Solution

Put and , so that and . Since , we have , and therefore

· = (Missing argument for \vec\vec u - Missing argument for \vec\vec v)·Missing argument for \vec\vec u = |Missing argument for \vec\vec u|^2 - Missing argument for \vec\vec u·Missing argument for \vec\vec v =

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Question ID VK-115399