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Q.

A and B are two vectors and θ is the angle between them, if  |A→×B→|=3(A→⋅B→) the value of θ is:

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a

60∘

b

30∘

c

45∘

d

90∘

answer is D.

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Detailed Solution

|A→×B→|=3(A→⋅B→)

⇒ABsinθ=3ABcosθ⇒ tanθ=3⇒θ=60∘

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