§ 29: 29.3

29.3 Розв’яжіть рівняння:

1) tg(–7x4) = 3; tg7x4 = –3; 7x4 = arctg(–3) + πn, n ∈ Z; 7x4 = –π3 + πn, n ∈ Z; x = –4π21 + 4πn7, n ∈ Z;

2) ctgx2 = 0; x2 = π2 + πn, n ∈ Z; x = π + 2πn, n ∈ Z;

3) ctg6x = 611; 6x = arctg611 + πn, n ∈ Z; x = 16 arctg611 + πn6, n ∈ Z;