If r(t)=⟨cos(t),sin(t)⟩\mathbf{r}(t) = \langle \cos(t), \sin(t) \rangler(t)=⟨cos(t),sin(t)⟩, what is the speed of the particle?
111
ttt
cos2(t)+sin2(t)\sqrt{\cos^2(t) + \sin^2(t)}cos2(t)+sin2(t)
000