If a and b are two unit vectors such that a+2 b and 5 a-4 b, are perpendicular to each other, the...

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If a and b are two unit vectors such that a+2 b and 5 a-4 b, 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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