It's not an ellipse if the axes have different periods: https://www.wolframalpha.com/input/?i=x%3Dsin%28t%29%2C+y%3Dsin%283*%28t%2Bpi%2F2%29%29 https://www.wolf

It's not an ellipse if the axes have different periods: https://www.wolframalpha.com/input/?i=x%3Dsin%28t%29%2C+y%3Dsin%283*%28t%2Bpi%2F2%29%29 https://www.wolframalpha.com/input/?i=x%3Dsin%28t%29%2C+y%3D... (Is there a name for this kind of curve?)