Let a and b be two unit vectors such that the angle between them is /4. If is the angle between the vectors ( a + b ) and ( a + 2 b + 2( a b )), then the value of 164 ^ 2 is equal to :

JEE Main 2022 Mathematics question

Let and be two unit vectors such that the angle between them is . If is the angle between the vectors and , then the value of is equal to :

Answer: (1)

, and has magnitude and is perpendicular to both. \hat{a}\hat{b}\sqrt{2}\sqrt{2.}\hat{a}\hat{b}\vec{c}\hat{a}\hat{b}$ +

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Question ID VK-035149