Решите уравнение cos30cosx-sin30sinx=-корень 2/2
Cos30°Cosx-Sin30°Sinx=- √2/2 Cos(30° + x) = -√2/2 30° +x = +-arcCos(-√2/2) + 360°k, k ∈z π/6 + х = +-π/4 + 2πk , k ∈Z x = +-π/4 + 2πk - π/6 , k ∈Z