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

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

(a) π/4 

(b) π/2

(c) cos–1(1/3) 

(d) cos–1(2/7)

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1 Answer

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Best answer

Answer is (b) π/2

Explanation:

Given,

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