I saw this post and wanted to post my answer to it. https://web2.0calc.com/questions/consider-a-particle-following-the-parametric-equations_2

I got: 1/6, 5/6, 13/6, and 17/6

Note that it can't be 7/6 or 11/6 because that would result in sin(\pi t) = -1/2. We want only sine values that will result in positive 1/2

Saphia1123 Feb 12, 2023