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If vector a and vector b are two unit vectors such that vector(a + 2b) and vector(5a - 4b) are perpendicular

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

(A) 45° 

(B) 60° 

(C) cos-1(1/3)

(D) cos-1(2/7)

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Correct option (B) 60°

Explanation:

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