Linear Algebra, 2020a

48 Chapter One. Linear Systems
2.23 Show that if ⃗v ≠ ⃗0 then ⃗v/|⃗v | has length one. What if ⃗v = ⃗0?
2.24 Show that if r 0 then r⃗v is r times as long as ⃗v. What if r0then the
cosine of the angle between k⃗u and ⃗v equals the cosine of the angle between ⃗u and
⃗v, and (2) if k