JEE Advanced 2010 Mathematics question
Two adjacent sides of a parallelogram ABCD are given by and . The side AD is rotated by an acute angle in the plane of the parallelogram so that AD becomes . If makes a right angle with the side AB, then the cosine of the angle is given by
Answer: (B)
Solution
, , . So the angle between AB and AD satisfies (θ is acute). AD is rotated in the plane of the
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