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Which of the following relations is true for two unit vector A ˆ and B ˆ making an angle θ to each other?

1. B ˆ A ˆ + = B ˆ – A ˆ tan 2 θ
2. B ˆ – A ˆ = B ˆ A ˆ + tan 2 θ
3. B ˆ A ˆ + = B ˆ – A ˆ cos 2 θ
4. B ˆ – A ˆ = B ˆ A ˆ + cos 2 θ

Correct answer: B ˆ – A ˆ = B ˆ A ˆ + tan 2 θ

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