Решите уравнение : cos(2x+п/3)=1/2

Cos(2x+π/3)=1/2
2x+π/3=+ π/3 + 2πk, k∈Z

1) 2x+π/3 =π/3 +2πk, k∈Z
    2x=π/3 - π/3 +2πk
    2x=2πk
     x=πk, k∈Z

2) 2x+π/3=-π/3 +2πk, k∈Z
    2x= -π/3 - π/3 +2πk
    2x= -2π/3 +2πk
      x= -π/3 + πk, k∈Z
ответ: πk, k∈Z;
          -π/3 +πk, k∈Z.