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JEE Main 2013 Mathematics question

MathematicsThree Dimensional GeometryJEE Main 2013

The acute angle between two lines such that the direction cosines l, m, n, of each of them satisfy the equations l + m + n = 0 and is :

Answer: (3)

Solution

With n = −(l + m): . The lines have direction ratios (0, 1, −1)

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Question ID VK-104054