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If a and b1 are two unit vectors such th...

If a and `b_1` are two unit vectors such that `a+2b and 5a-4b` are perpendicular to each other, then the angle between a and b is

A

`45^(@)`

B

`60^(@)`

C

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

D

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

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