Реши уравнения

1. \(\ctg x=-3,5\) .
2. \(\ctg x=\cfrac{8}{5}\) .
3. \(\ctg x=0,3\) .
4. \(\ctg x=-0,45\) .

Ответ.

1. [ ] \(+\) [ ], \(k\in \Z\) .
2. [ ] \(+\) [ ], \(n\in \Z\) .
3. [ ] \(+\) [ ], \(m\in Z\) .
4. [ ] \(+\) [ ], \(k\in \Z\) .