use a half angle identity to evaluate the exact value of tan67.5
https://academicpapers.net/wp-content/uploads/2020/08/LOGO-300x75.png00Lizhttps://academicpapers.net/wp-content/uploads/2020/08/LOGO-300x75.pngLiz2021-04-05 23:01:442021-04-05 23:01:44use a half angle identity to evaluate the exact value of tan67.5