sedinalana а)sinx<0,5
x∈(5π/6+2πk;13π/6+2πk,k∈z)
Б) cosx>0,5
x∈(-π/3+2πk;π/3+2πk,k∈z)
в)tgx<=-3
x∈(-π/2+πk;-arctg3+πk,k∈z]