# How to remove downvote after the grace period expired?

I accidentally cast a downvote which I want to remove (Computing $\cos\frac{\pi}{7}$). I found about it too late to reverse my vote and am looking for help in what I can do. The Help desk was no help at all so I turn to the community.

• i have don this too and my remedy was to cast an upvote and leave a comment. Mar 20, 2016 at 14:47
• Mar 20, 2016 at 15:31