Sine and Cosine – Definition & Meaning – Part 1 – What is Sin(x) & Cos(x) ?
https://www.youtube.com/watch?v=vuoNyvMvDtA
https://www.youtube.com/watch?v=vuoNyvMvDtA
https://www.theguardian.com/education/2021/sep/06/exam-system-in-england-needs-an-overhaul-says-schools-leader