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 perpendicualar to each other, then the angle between `veca and vecb` is

A

`45^(@)`

B

`60^(@)`

C

`cos^(-1)((1)/(3))`

D

`cos^(-1)((2)/(7))`

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The correct Answer is:

B

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