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If veca and vecb are two unit vectors su...

If `veca and vecb` are two unit vectors such that `veca+2vecb and 5 veca-4vecb` are perpendicular to each othre, then the angle beween `veca and vecb` is (A) `45^0` (B) `60^0` (C) `cos^-1(1/30` (D) `cos^-1(2/7)`

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