JEE Main 2024 Mathematics question
Let , and , x ∈ R. If is the unit vector in the direction of such that = 1, then is equal to
Answer: (D)
Solution
a·d = 1 with d = (b + c)/|b + c| gives a·(b + c) = |b + c|: x + 6 = √((x + 2)² + 40),
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