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For two unit vectors hat(A) and hat(B), ...

For two unit vectors `hat(A)` and `hat(B)`, it is given that ` hat(A) + hat(B) = 2 (hat(A) - hat(B)) ` then the angle between two vectors is

A

`sin^-1 (1/3)`

B

`sin^-1 (3/5)`

C

`cos^-1 (1/3)`

D

`cos^-1 (3/5)`

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