1) sin x < √2/2

-π-arcsin(√2/2)+2πn<х<arcsin(√2/2)+2πn;n∈Z;

-π-π/4+2πn<х<π/4+2πn;n∈Z;

-5π/4+2πn<х<π/4+2πn;n∈Z;

2) cos x ≤ 1/2

arccos(1/2)+2πn≤х≤2π-arccos(1/2)+2πn;n∈Z;

π/3+2πn≤х≤2π-π/3+2πn;n∈Z;

π/3+2πn≤х≤5π/3+2πn;n∈Z;

3) tg x ≥ 1

arctg1+πn≤x<π/2+πn;n∈Z;

π/4+πn≤x<π/2+πn;n∈Z;

4) ctg x > √3

πn<x<arcctg√3+πn;n∈Z;

πn<x<π/6+πn;n∈Z;