Question

$2 \cos(x) = - 1$
​

Answer 1

Ответ:

x₁=2πn+(2π/3), n∈Z

x₂=2πk+(4π/3), k∈Z

Объяснение:

2cosx=-1

cosx=-1/2

x₁=2πn+(2π/3), n∈Z

x₂=2πk+(4π/3), k∈Z