If a +3 b =3 i - j and 2 a + b = i -2 j , then what is the angle between a and b ?

NDA 2021 Mathematics question

If and , then what is the angle between and ?

Answer: (D)

Multiply the first equation by 2 and subtract the second: \vec\vec\vec\vec\hat\hat\hat\hat\vec\hat\vec\hat$

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Question ID VK-033678