1 | initial version |

Thanks for the trac ticket.

Here is another one with a problem:

```
polar_plot(3*sqrt(cos(2*theta)),(theta, 0, 2*pi))
```

gives the follow graph:

```
> ![image description](http://)
>
> Sorry, file uploading requires karma > 60
```

Arrrgh!

Well, ok try it yourslf. On my v.4.6.1 worksheet I see a plot with some weird discontinuity near the origin.

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