# How do I use CurveArrow?

I would like to plot a parametric equation with an arrow along it, to verify that the orientation is correct. I found CurveArrow which looks like what I want, but I can't figure out how to use it.

I did

```
from sage.plot.arrow import CurveArrow
t=var('t')
p = parametric_plot((2*cos(-t), sin(-t)), (t, 0, 2*pi))
a = CurveArrow(p, options={})
```

which succeeds with no errors. However, I am not sure how to actually display the plot with the arrow. Evaluating `a`

just prints `CurveArrow from (2.0, -0.0) to (2.0, 2.4492935982947064e-16)`

. I also tried `a.show()`

, resulting in `AttributeError: 'CurveArrow' object has no attribute 'show'`

, and I tried `(p+a).show()`

, resulting in `TypeError: other (=CurveArrow from (2.0, -0.0) to (2.0, 2.4492935982947064e-16)) must be a Graphics objects`

.

I'm using Sage 10.3 on MacOS under Jupyter.

Bonus: it looks like this would just plot one arrow at the beginning or ending point of the curve. Is there a simple way to plot several arrows at various points along the curve?