Question

Ребят, Помогите!!!!Нужно выбрать 1 правильный вариант

Answer 1

1) x = (+ -)π/6 + 2πn, n∈Z
2) (-1)^(n+1)(π/3) + πn, n∈z
3) x = (+ -)(5π/6) + 2πn, n∈Z
4) x = π/2 + πn, n∈Z
5) -π/4 + 2πn, n∈Z < x < 5π/4 + 2πn, n∈z
6) -7π/6 + 2πn, n∈z < x <  π/6 + 2πn, n∈Z
7) x = πn, n∈Z
8) cosx =  - 1/√2
x = (+ -)arccos(-1/√2) + 2πn, n∈Z
x = (+ -)(π - π/4) + 2πn, n∈Z
x = (+ -)(3π/4)+ 2πn, n∈Z