Question

помогите решить 2cosx+1=0

Answer 1

2cosx + 1 = 0
2cosx = -1
cosx = -0.5
x = -2π/3 + 2πn, n ∈ Z

Answer 2

2cosx+1=0
2cosx=-1
cosx=-1/2
x=-П/3+2Пк, к€Z.