1)arctg^2 x/3 -4 arctg x/3 -5 =0 2) arctg^2 (3x +2) + 2arctg (3x+2) =0
3) 2 arcsin x = π/3 +π/9 arcsin x
4) 3 arctg ^2 x -4arctg +π^2 =0​

kamikot    2   26.10.2020 18:52    5