-1/2*сos(x/2-π/6)=0/*(-2)
cos(x/2-/6)=0
x/2-π/6=π/2+πn
x/2=π/6+π/2+πn
x/2=4π/6+πn
x/2=2π/3+πn/*2
x=4π/3+2πn
n=0 x=4π/3
b=1 x=4π/3+2π=10π/3
4π/3+10π/3=14/3
x/2=7π/3
y(7⇒/3)=-1/2*cos(7π/3-π/6)=-1/2*cos(14π/6-π/6)=-1/2*cos(13π/6)=
=-1/2cos(2π+π/6)=-1/2*cosπ/6=-1/2*√3/2=-√3/4
x/2=14π/3:2=7