18.9. Теңдеуді шешіңдер: 1) 18arctgʻx – 31 arctgx – T2 = 0;
2) 16arcctgʻx – 16narcctgx + 3^2 = 0;
3) arctg(x2 – 9) = arctg8x;
4) arcctg(x2 – x) = arcctg(4x – 6)​

Garri14    2   21.10.2020 11:56    5