JEE Main 2007 Mathematics question

Mathematics Vector Algebra JEE Main 2007

If and are unit vectors and is the acute angle between them, then is a unit vector for

(1)exactly two values of
(2)more than two values of
(3)no value of
(4)exactly one value of Correct

Answer: (4)

Solution

, which has exactly one acute solution, option (4).

Question ID VK-038999