1) Сtgx = 1
x = arcCtg1 + π k , k∈Z
x = π/4 + πk , k ∈Z
Ответ: π/4
2)Cosx/2 = √2/2
x/2 = +-arcCos(√2/2) + 2πk , k ∈Z
x/2 = +-π/4 + 2πk , k∈Z
x = +-π/2 +4πk , k ∈Z
Ответ: π/2
3)2Sinx = √3
Sinx = √3/2
x = (-1)^narcSin√3/2 + nπ, n ∈Z
x = (-1)^n π/3 + nπ, n ∈ Z
Ответ: 2π/3