JEE Advanced Mathematics question
If are unit vectors such that is also a unit vector then the angle between the vectors and is
Answer: (D)
Solution
1 = | a + b|^2 = 1 + 1 + 2θ ⇒ θ = -12 ⇒ θ = .
If are unit vectors such that is also a unit vector then the angle between the vectors and is
1 = | a + b|^2 = 1 + 1 + 2θ ⇒ θ = -12 ⇒ θ = .