РЕШИТЕ СИСТЕМУ УРАВНЕНИЙ:
{cosx +cosy =√3 ; x+y =π/3 .⇔{2cos(x+y)/2*cos(x-y)/2=√3 ; x+y =π/3.⇔ {2cosπ/6*cos(x-y)/2=√3 ; x+y =π/3.⇔{cos(x-y)/2=1 ; x+y =π/3.⇒ {x+y =π/3 ; x-y =4πn ,n∈Z . || + и - || { x = π/6 +2πn ;y =π/6 -2πn ,n∈Z.