sin(3x+П/4)≤√2/2
-π-arcsina<x<arcsina+2πn, n∈z
-π-π/4+2πn<3x+П/4<π/4+2πn, n∈z
-2π/2-π/2+2πn<3x<2πn, n∈z
-3π/2+2πn<3x<2πn, n∈z
-π/2+2πn/3<x<2πn/3, n∈z
sin(3x+П/4)≤√2/2
-π-arcsina<x<arcsina+2πn, n∈z
-π-π/4+2πn<3x+П/4<π/4+2πn, n∈z
-2π/2-π/2+2πn<3x<2πn, n∈z
-3π/2+2πn<3x<2πn, n∈z
-π/2+2πn/3<x<2πn/3, n∈z