That works, but not with plottools.

> with(plots): with(plottools):

   animate(arrow,[[0,0],[0,cos(t)]],t=0..4*Pi,view=[-1..1,-1..1]);

I don't know why.

That works, but not with plottools.

> with(plots): with(plottools):

   animate(arrow,[[0,0],[0,cos(t)]],t=0..4*Pi,view=[-1..1,-1..1]);

I don't know why.