If a , b , c are non-coplanar unit vectors such that a ( b c )= b + c 2 , then the angle between a and b is

MHT CET 2023 Mathematics question

If are non-coplanar unit vectors such that , then the angle between and is

Answer: (A)

Expand the vector triple product: . Equate with . Since are non-coplanar with (in particular linearly independent), the coefficients

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Question ID VK-097936