find tan (actan3+arctan5+arctan7) express as a rational number
https://academicpapers.net/wp-content/uploads/2020/08/LOGO-300x75.png00Lizhttps://academicpapers.net/wp-content/uploads/2020/08/LOGO-300x75.pngLiz2021-04-08 05:14:472021-04-08 05:14:47find tan (actan3+arctan5+arctan7) express as a rational number