If \bo {a} and \bo {b} are two unit vectors such that \bo {a}+2 \bo {b} and 5 \bo {a}-4 \bo {b} are perpendicular to each other, then angle between \bo {a} and \bo {b} is

CGPET 2021 Solved Paper

Section: Mathematics

Question : 148 of 150

Marks: +1, -0

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

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