VectorHard

Question

Let and be two unit vectors such that | + | = √3. If = + 2 + ( × ), than2 || is equal to :

Options

A.
B.
C.
D.

Solution

= √3
⇒ = 3
⇒ 1 + 1 + 2.1.1 cos θ = 3
⇒ cos θ =
⇒ θ =     ......(1)
∵ 
⇒ = 1 -
⇒ =



= 1 + 4 + 4
= 7 +

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