3tgx+ корень из 3=0 на [0;2п]
Tgx=-√3/3 x=-π/6+πn n∈Z [0;2π] n=1 x=π-π/6=5π/6 n=2 -π/6+2π=11/6π n=3 x=-π/6+3π>2π подходят 5π/6; 11π/6