I can't find the question, where did it go :(

Do you know when this was from?

o.o I tried looking for cosine stuff on web2.0 to no avail! Sorry :/

Wait I think I found it! Here it is, If I'm not mistaken:

https://web2.0calc.com/questions/find-the-3-smallest-positive-x-intercepts-of-the

If you know you posted there, you can go to your profile and see the "answers" page.

A suggestion of how you can track the posts you are interested in:

I use my watchlist but I am often afraid things will fall off the end of it. I think only 25 posts are stored there.

I have other methods of trying to keep posts that I am interested in too.

BUT a method I have only just started using recently is to take a pic of the post then private message myself.

I send myself both the actual address of the post as well as a pic of it. 

So long as I remember to do it (which I didn't do here) it works really well.

Thanks for all your help guys and girls. :)

Of course. And thanks for your advice!