For v and W∈R 8
, if ∥v−w∥=3,∥v∥=5 and ∥w∥=2 Then v⋅W= (Hint: Use the fact that ∥v−w∥ 2
=(v−w)⋅(v−w).) If θ is the angle between the vectors v and w, then cosθ=