A particle moves along the path r(t)=⟨sin(t),cos(t),t⟩\mathbf{r}(t) = \langle \sin(t), \cos(t), t \rangler(t)=⟨sin(t),cos(t),t⟩ for 0≤t≤2π0 \le t \le 2\pi0≤t≤2π. What is its speed?
111
2\sqrt{2}2
ttt
2π2\pi2π