If and are two unit vectors such that a +2 b and 5 a -4 b are perpendicular to each other…
Mathematics · JEE Advanced · NTA Exams — Vector Algebra
If 
and 
are two unit vectors such that \(\vec{a}+2 \vec{b}\)and \(5 \vec{a}-4 \vec{b}\)are perpendicular to each other then the angle between and 
is
and are two unit vectors such that \(\vec{a}+2 \vec{b}\)and \(5 \vec{a}-4 \vec{b}\)are perpendicular to each other then the angle between and is- 45°
- 60°
Answer
(B) 60 °
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