Question

what is the angle between two unit vector​

Answer 1

Explanation:

The vector a−2–√ba−2b is unit so |a−2–√b|2=1|a−2b|2=1 that is

1=(a−2–√b).(a−2–√b)=a.a−22–√a.b+2b.b=2−22–√a.b1=(a−2b).(a−2b)=a.a−22a.b+2b.b=2−22a.b

this concludes that a.b=2–√4a.b=24. The angle between aa and bb is

cosθ=a.b|a||b|=a.b|a||b|=2–√4

Answer 2

Answer:

Formula for the angle between to actor.this is true when is a unit vector pointing in any direction . where is the angle between to angle vector. this formula automatictly the dot product of perpendicular vector is zero (because cos 90 is zero.