Sin(x+π/6)cos(x+π/6) больше 0,25

sin(x+π/6)*cos(x+π/6)>0,25 1/2*(2sin(x+π/6)*cos(x+π/6))>0,25 1/2*sin(2(x+π/6))>0,25 sin(2x+π/3)>0,5 π/6+2πn<2x+π/3<5π/6+2πn, n∈Z π/6-π/3+2πn<2x<5π/6-π/3+2πn, n∈Z -π/6+2πn<2x<π/2+2πn, n∈Z -π/12+πn