網頁前端動畫之三角函數教學備份

資料來源:

https://w3ctrain.com/2018/08/20/trigonometry-you-must-know/
https://juejin.im/post/5b4ffa045188251b134e7211

GITHUB: https://github.com/jash-git/HTML_Trigonometric-function_Animation